diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7d9eb4..c5f88b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Changed
 - Updated development dependencies (`armitage-rubocop`);
+- Constant renaming: all constants and constant parts were renamed from `Acquier` to `Acquirer`;
 ## Added
 - Type signatures (`RBS`, see the `sig` directory) + `Steep` integration (see `Steepfile` for details);
 
@@ -21,7 +22,7 @@
 
 ## [1.11.0] - 2024-08-11
 ### Changed
-- Lock Acquierment Timeout (`acq_timeout`/`queue_ttl`): more correct timeout error interception
+- Lock Acquirement Timeout (`acq_timeout`/`queue_ttl`): more correct timeout error interception
   inside the `RedisQueuedLocks::Acquier::AcquireLock::WithAcqTimeout` logic that now raises and
   intercepts an internal timeout error class in order to prevent interceptions of
   other timeouts that can be raised from the wrapped block of code;
diff --git a/lib/redis_queued_locks.rb b/lib/redis_queued_locks.rb
index 9400c7d..a5b861a 100644
--- a/lib/redis_queued_locks.rb
+++ b/lib/redis_queued_locks.rb
@@ -17,7 +17,7 @@ module RedisQueuedLocks
   require_relative 'redis_queued_locks/data'
   require_relative 'redis_queued_locks/debugger'
   require_relative 'redis_queued_locks/resource'
-  require_relative 'redis_queued_locks/acquier'
+  require_relative 'redis_queued_locks/acquirer'
   require_relative 'redis_queued_locks/instrument'
   require_relative 'redis_queued_locks/swarm'
   require_relative 'redis_queued_locks/client'
diff --git a/lib/redis_queued_locks/acquier.rb b/lib/redis_queued_locks/acquier.rb
deleted file mode 100644
index 413ac32..0000000
--- a/lib/redis_queued_locks/acquier.rb
+++ /dev/null
@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-# @api private
-# @since 1.0.0
-module RedisQueuedLocks::Acquier
-  require_relative 'acquier/acquire_lock'
-  require_relative 'acquier/release_lock'
-  require_relative 'acquier/release_all_locks'
-  require_relative 'acquier/is_locked'
-  require_relative 'acquier/is_queued'
-  require_relative 'acquier/lock_info'
-  require_relative 'acquier/queue_info'
-  require_relative 'acquier/locks'
-  require_relative 'acquier/queues'
-  require_relative 'acquier/keys'
-  require_relative 'acquier/extend_lock_ttl'
-  require_relative 'acquier/clear_dead_requests'
-end
diff --git a/lib/redis_queued_locks/acquirer.rb b/lib/redis_queued_locks/acquirer.rb
new file mode 100644
index 0000000..c3e384b
--- /dev/null
+++ b/lib/redis_queued_locks/acquirer.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+# @api private
+# @since 1.0.0
+module RedisQueuedLocks::Acquirer
+  require_relative 'acquirer/acquire_lock'
+  require_relative 'acquirer/release_lock'
+  require_relative 'acquirer/release_all_locks'
+  require_relative 'acquirer/is_locked'
+  require_relative 'acquirer/is_queued'
+  require_relative 'acquirer/lock_info'
+  require_relative 'acquirer/queue_info'
+  require_relative 'acquirer/locks'
+  require_relative 'acquirer/queues'
+  require_relative 'acquirer/keys'
+  require_relative 'acquirer/extend_lock_ttl'
+  require_relative 'acquirer/clear_dead_requests'
+end
diff --git a/lib/redis_queued_locks/acquier/acquire_lock.rb b/lib/redis_queued_locks/acquirer/acquire_lock.rb
similarity index 99%
rename from lib/redis_queued_locks/acquier/acquire_lock.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock.rb
index e6fb6d6..318c26a 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock.rb
@@ -8,7 +8,7 @@
 # rubocop:disable Metrics/ClassLength
 # rubocop:disable Metrics/BlockNesting
 # rubocop:disable Style/IfInsideElse
-module RedisQueuedLocks::Acquier::AcquireLock
+module RedisQueuedLocks::Acquirer::AcquireLock
   require_relative 'acquire_lock/log_visitor'
   require_relative 'acquire_lock/instr_visitor'
   require_relative 'acquire_lock/delay_execution'
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/delay_execution.rb b/lib/redis_queued_locks/acquirer/acquire_lock/delay_execution.rb
similarity index 88%
rename from lib/redis_queued_locks/acquier/acquire_lock/delay_execution.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/delay_execution.rb
index 42ede71..6e60cb9 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/delay_execution.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/delay_execution.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::AcquireLock::DelayExecution
+module RedisQueuedLocks::Acquirer::AcquireLock::DelayExecution
   # Sleep with random time-shifting (it is necessary for empty lock-acquirement time slots).
   #
   # @param retry_delay [Integer] In milliseconds
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue.rb b/lib/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue.rb
similarity index 93%
rename from lib/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue.rb
index ae93cac..e628120 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.7.0
-module RedisQueuedLocks::Acquier::AcquireLock::DequeueFromLockQueue
+module RedisQueuedLocks::Acquirer::AcquireLock::DequeueFromLockQueue
   require_relative 'dequeue_from_lock_queue/log_visitor'
 
   # @param redis [RedisClient]
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue/log_visitor.rb b/lib/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue/log_visitor.rb
similarity index 92%
rename from lib/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue/log_visitor.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue/log_visitor.rb
index 2497c04..1759e52 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue/log_visitor.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue/log_visitor.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.7.0
-module RedisQueuedLocks::Acquier::AcquireLock::DequeueFromLockQueue::LogVisitor
+module RedisQueuedLocks::Acquirer::AcquireLock::DequeueFromLockQueue::LogVisitor
   class << self
     # @param logger [::Logger,#debug]
     # @param log_sampled [Boolean]
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/instr_visitor.rb b/lib/redis_queued_locks/acquirer/acquire_lock/instr_visitor.rb
similarity index 98%
rename from lib/redis_queued_locks/acquier/acquire_lock/instr_visitor.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/instr_visitor.rb
index b55d706..f26fccb 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/instr_visitor.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/instr_visitor.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.7.0
-module RedisQueuedLocks::Acquier::AcquireLock::InstrVisitor
+module RedisQueuedLocks::Acquirer::AcquireLock::InstrVisitor
   class << self
     # @param instrumenter [#notify]
     # @param instr_sampled [Boolean]
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/log_visitor.rb b/lib/redis_queued_locks/acquirer/acquire_lock/log_visitor.rb
similarity index 98%
rename from lib/redis_queued_locks/acquier/acquire_lock/log_visitor.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/log_visitor.rb
index 26388b0..03f3d82 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/log_visitor.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/log_visitor.rb
@@ -3,7 +3,7 @@
 # @api private
 # @since 1.7.0
 # rubocop:disable Metrics/ModuleLength
-module RedisQueuedLocks::Acquier::AcquireLock::LogVisitor
+module RedisQueuedLocks::Acquirer::AcquireLock::LogVisitor
   # rubocop:disable Metrics/ClassLength
   class << self
     # @param logger [::Logger,#debug]
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/try_to_lock.rb b/lib/redis_queued_locks/acquirer/acquire_lock/try_to_lock.rb
similarity index 99%
rename from lib/redis_queued_locks/acquier/acquire_lock/try_to_lock.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/try_to_lock.rb
index 2441a63..1ecf039 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/try_to_lock.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/try_to_lock.rb
@@ -4,7 +4,7 @@
 # @since 1.0.0
 # @version 1.7.0
 # rubocop:disable Metrics/ModuleLength
-module RedisQueuedLocks::Acquier::AcquireLock::TryToLock
+module RedisQueuedLocks::Acquirer::AcquireLock::TryToLock
   require_relative 'try_to_lock/log_visitor'
 
   # @return [String]
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/try_to_lock/log_visitor.rb b/lib/redis_queued_locks/acquirer/acquire_lock/try_to_lock/log_visitor.rb
similarity index 99%
rename from lib/redis_queued_locks/acquier/acquire_lock/try_to_lock/log_visitor.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/try_to_lock/log_visitor.rb
index 0a5e5f0..ae4dc89 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/try_to_lock/log_visitor.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/try_to_lock/log_visitor.rb
@@ -3,7 +3,7 @@
 # @api private
 # @since 1.7.0
 # rubocop:disable Metrics/ModuleLength
-module RedisQueuedLocks::Acquier::AcquireLock::TryToLock::LogVisitor
+module RedisQueuedLocks::Acquirer::AcquireLock::TryToLock::LogVisitor
   # rubocop:disable Metrics/ClassLength
   class << self
     # @param logger [::Logger,#debug]
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/with_acq_timeout.rb b/lib/redis_queued_locks/acquirer/acquire_lock/with_acq_timeout.rb
similarity index 91%
rename from lib/redis_queued_locks/acquier/acquire_lock/with_acq_timeout.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/with_acq_timeout.rb
index 1fc3ae0..888d398 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/with_acq_timeout.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/with_acq_timeout.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::AcquireLock::WithAcqTimeout
+module RedisQueuedLocks::Acquirer::AcquireLock::WithAcqTimeout
   # @param redis [RedisClient]
   #   Redis connection manager required for additional data extraction for error message.
   # @param timeout [NilClass,Integer]
@@ -47,8 +47,8 @@ def with_acq_timeout(
         # TODO: rewrite these invocations to separated inner-AcquireLock-related modules
         #   in order to remove any dependencies from the other public RQL commands cuz
         #   all AcquireLock logic elements should be fully independent from others as a core;
-        lock_info = RedisQueuedLocks::Acquier::LockInfo.lock_info(redis, lock_name)
-        queue_info = RedisQueuedLocks::Acquier::QueueInfo.queue_info(redis, lock_name)
+        lock_info = RedisQueuedLocks::Acquirer::LockInfo.lock_info(redis, lock_name)
+        queue_info = RedisQueuedLocks::Acquirer::QueueInfo.queue_info(redis, lock_name)
 
         # rubocop:disable Metrics/BlockNesting
         raise(
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/yield_expire.rb b/lib/redis_queued_locks/acquirer/acquire_lock/yield_expire.rb
similarity index 97%
rename from lib/redis_queued_locks/acquier/acquire_lock/yield_expire.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/yield_expire.rb
index f347366..c5fa245 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/yield_expire.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/yield_expire.rb
@@ -3,7 +3,7 @@
 # @api private
 # @since 1.3.0
 # @version 1.7.0
-module RedisQueuedLocks::Acquier::AcquireLock::YieldExpire
+module RedisQueuedLocks::Acquirer::AcquireLock::YieldExpire
   require_relative 'yield_expire/log_visitor'
 
   # @return [String]
@@ -18,7 +18,7 @@ module RedisQueuedLocks::Acquier::AcquireLock::YieldExpire
   # @param redis [RedisClient] Redis connection.
   # @param logger [::Logger,#debug] Logger object.
   # @param lock_key [String] Obtained lock key that should be expired.
-  # @param acquier_id [String] Acquier identifier.
+  # @param acquier_id [String] Acquirer identifier.
   # @param host_id [String] Host identifier.
   # @param access_strategy [Symbol] Lock obtaining strategy.
   # @param timed [Boolean] Should the lock be wrapped by Timeout with with lock's ttl
diff --git a/lib/redis_queued_locks/acquier/acquire_lock/yield_expire/log_visitor.rb b/lib/redis_queued_locks/acquirer/acquire_lock/yield_expire/log_visitor.rb
similarity index 96%
rename from lib/redis_queued_locks/acquier/acquire_lock/yield_expire/log_visitor.rb
rename to lib/redis_queued_locks/acquirer/acquire_lock/yield_expire/log_visitor.rb
index ab6adc8..8dbfd51 100644
--- a/lib/redis_queued_locks/acquier/acquire_lock/yield_expire/log_visitor.rb
+++ b/lib/redis_queued_locks/acquirer/acquire_lock/yield_expire/log_visitor.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.7.0
-module RedisQueuedLocks::Acquier::AcquireLock::YieldExpire::LogVisitor
+module RedisQueuedLocks::Acquirer::AcquireLock::YieldExpire::LogVisitor
   class << self
     # @param logger [::Logger,#debug]
     # @param log_sampled [Boolean]
diff --git a/lib/redis_queued_locks/acquier/clear_dead_requests.rb b/lib/redis_queued_locks/acquirer/clear_dead_requests.rb
similarity index 97%
rename from lib/redis_queued_locks/acquier/clear_dead_requests.rb
rename to lib/redis_queued_locks/acquirer/clear_dead_requests.rb
index 0a93338..1422191 100644
--- a/lib/redis_queued_locks/acquier/clear_dead_requests.rb
+++ b/lib/redis_queued_locks/acquirer/clear_dead_requests.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::ClearDeadRequests
+module RedisQueuedLocks::Acquirer::ClearDeadRequests
   class << self
     # @param redis_client [RedisClient]
     # @param scan_size [Integer]
diff --git a/lib/redis_queued_locks/acquier/extend_lock_ttl.rb b/lib/redis_queued_locks/acquirer/extend_lock_ttl.rb
similarity index 97%
rename from lib/redis_queued_locks/acquier/extend_lock_ttl.rb
rename to lib/redis_queued_locks/acquirer/extend_lock_ttl.rb
index dcc2462..ad058a1 100644
--- a/lib/redis_queued_locks/acquier/extend_lock_ttl.rb
+++ b/lib/redis_queued_locks/acquirer/extend_lock_ttl.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::ExtendLockTTL
+module RedisQueuedLocks::Acquirer::ExtendLockTTL
   # @return [String]
   #
   # @api private
diff --git a/lib/redis_queued_locks/acquier/is_locked.rb b/lib/redis_queued_locks/acquirer/is_locked.rb
similarity index 90%
rename from lib/redis_queued_locks/acquier/is_locked.rb
rename to lib/redis_queued_locks/acquirer/is_locked.rb
index 7ccaac2..712fd77 100644
--- a/lib/redis_queued_locks/acquier/is_locked.rb
+++ b/lib/redis_queued_locks/acquirer/is_locked.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::IsLocked
+module RedisQueuedLocks::Acquirer::IsLocked
   class << self
     # @param redis_client [RedisClient]
     # @param lock_name [String]
diff --git a/lib/redis_queued_locks/acquier/is_queued.rb b/lib/redis_queued_locks/acquirer/is_queued.rb
similarity index 90%
rename from lib/redis_queued_locks/acquier/is_queued.rb
rename to lib/redis_queued_locks/acquirer/is_queued.rb
index f270ab0..eace441 100644
--- a/lib/redis_queued_locks/acquier/is_queued.rb
+++ b/lib/redis_queued_locks/acquirer/is_queued.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::IsQueued
+module RedisQueuedLocks::Acquirer::IsQueued
   class << self
     # @param redis_client [RedisClient]
     # @param lock_name [String]
diff --git a/lib/redis_queued_locks/acquier/keys.rb b/lib/redis_queued_locks/acquirer/keys.rb
similarity index 93%
rename from lib/redis_queued_locks/acquier/keys.rb
rename to lib/redis_queued_locks/acquirer/keys.rb
index c14e861..d71764a 100644
--- a/lib/redis_queued_locks/acquier/keys.rb
+++ b/lib/redis_queued_locks/acquirer/keys.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::Keys
+module RedisQueuedLocks::Acquirer::Keys
   class << self
     # @param redis_client [RedisClient]
     # @option scan_size [Integer]
diff --git a/lib/redis_queued_locks/acquier/lock_info.rb b/lib/redis_queued_locks/acquirer/lock_info.rb
similarity index 98%
rename from lib/redis_queued_locks/acquier/lock_info.rb
rename to lib/redis_queued_locks/acquirer/lock_info.rb
index 453ca1a..7255885 100644
--- a/lib/redis_queued_locks/acquier/lock_info.rb
+++ b/lib/redis_queued_locks/acquirer/lock_info.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::LockInfo
+module RedisQueuedLocks::Acquirer::LockInfo
   class << self
     # @param redis_client [RedisClient]
     # @param lock_name [String]
diff --git a/lib/redis_queued_locks/acquier/locks.rb b/lib/redis_queued_locks/acquirer/locks.rb
similarity index 99%
rename from lib/redis_queued_locks/acquier/locks.rb
rename to lib/redis_queued_locks/acquirer/locks.rb
index 6a72d58..240b455 100644
--- a/lib/redis_queued_locks/acquier/locks.rb
+++ b/lib/redis_queued_locks/acquirer/locks.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::Locks
+module RedisQueuedLocks::Acquirer::Locks
   class << self
     # @param redis_client [RedisClient]
     # @option scan_size [Integer]
diff --git a/lib/redis_queued_locks/acquier/queue_info.rb b/lib/redis_queued_locks/acquirer/queue_info.rb
similarity index 97%
rename from lib/redis_queued_locks/acquier/queue_info.rb
rename to lib/redis_queued_locks/acquirer/queue_info.rb
index 6f5a805..2d1d111 100644
--- a/lib/redis_queued_locks/acquier/queue_info.rb
+++ b/lib/redis_queued_locks/acquirer/queue_info.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::QueueInfo
+module RedisQueuedLocks::Acquirer::QueueInfo
   class << self
     # Returns an information about the required lock queue by the lock name. The result
     # represnts the ordered lock request queue that is ordered by score (Redis sets) and shows
diff --git a/lib/redis_queued_locks/acquier/queues.rb b/lib/redis_queued_locks/acquirer/queues.rb
similarity index 98%
rename from lib/redis_queued_locks/acquier/queues.rb
rename to lib/redis_queued_locks/acquirer/queues.rb
index e70e9e4..84dde2d 100644
--- a/lib/redis_queued_locks/acquier/queues.rb
+++ b/lib/redis_queued_locks/acquirer/queues.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::Queues
+module RedisQueuedLocks::Acquirer::Queues
   class << self
     # @param redis_client [RedisClient]
     # @option scan_size [Integer]
diff --git a/lib/redis_queued_locks/acquier/release_all_locks.rb b/lib/redis_queued_locks/acquirer/release_all_locks.rb
similarity index 99%
rename from lib/redis_queued_locks/acquier/release_all_locks.rb
rename to lib/redis_queued_locks/acquirer/release_all_locks.rb
index 9d8cdb8..8258c22 100644
--- a/lib/redis_queued_locks/acquier/release_all_locks.rb
+++ b/lib/redis_queued_locks/acquirer/release_all_locks.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::ReleaseAllLocks
+module RedisQueuedLocks::Acquirer::ReleaseAllLocks
   # @since 1.0.0
   extend RedisQueuedLocks::Utilities
 
diff --git a/lib/redis_queued_locks/acquier/release_lock.rb b/lib/redis_queued_locks/acquirer/release_lock.rb
similarity index 99%
rename from lib/redis_queued_locks/acquier/release_lock.rb
rename to lib/redis_queued_locks/acquirer/release_lock.rb
index 40f4648..3e08687 100644
--- a/lib/redis_queued_locks/acquier/release_lock.rb
+++ b/lib/redis_queued_locks/acquirer/release_lock.rb
@@ -2,7 +2,7 @@
 
 # @api private
 # @since 1.0.0
-module RedisQueuedLocks::Acquier::ReleaseLock
+module RedisQueuedLocks::Acquirer::ReleaseLock
   # @since 1.0.0
   extend RedisQueuedLocks::Utilities
 
diff --git a/lib/redis_queued_locks/client.rb b/lib/redis_queued_locks/client.rb
index deff4c8..bb9a5ad 100644
--- a/lib/redis_queued_locks/client.rb
+++ b/lib/redis_queued_locks/client.rb
@@ -438,7 +438,7 @@ def lock(
     instr_sample_this: false,
     &block
   )
-    RedisQueuedLocks::Acquier::AcquireLock.acquire_lock(
+    RedisQueuedLocks::Acquirer::AcquireLock.acquire_lock(
       redis_client,
       lock_name,
       process_id: RedisQueuedLocks::Resource.get_process_id,
@@ -585,7 +585,7 @@ def unlock(
     instr_sampler: config[:instr_sampler], # steep:ignore
     instr_sample_this: false
   )
-    RedisQueuedLocks::Acquier::ReleaseLock.release_lock(
+    RedisQueuedLocks::Acquirer::ReleaseLock.release_lock(
       redis_client,
       lock_name,
       instrumenter,
@@ -608,7 +608,7 @@ def unlock(
   # @api public
   # @since 1.0.0
   def locked?(lock_name)
-    RedisQueuedLocks::Acquier::IsLocked.locked?(redis_client, lock_name)
+    RedisQueuedLocks::Acquirer::IsLocked.locked?(redis_client, lock_name)
   end
 
   # @param lock_name [String]
@@ -617,7 +617,7 @@ def locked?(lock_name)
   # @api public
   # @since 1.0.0
   def queued?(lock_name)
-    RedisQueuedLocks::Acquier::IsQueued.queued?(redis_client, lock_name)
+    RedisQueuedLocks::Acquirer::IsQueued.queued?(redis_client, lock_name)
   end
 
   # @param lock_name [String]
@@ -626,7 +626,7 @@ def queued?(lock_name)
   # @api public
   # @since 1.0.0
   def lock_info(lock_name)
-    RedisQueuedLocks::Acquier::LockInfo.lock_info(redis_client, lock_name)
+    RedisQueuedLocks::Acquirer::LockInfo.lock_info(redis_client, lock_name)
   end
 
   # @param lock_name [String]
@@ -635,7 +635,7 @@ def lock_info(lock_name)
   # @api public
   # @since 1.0.0
   def queue_info(lock_name)
-    RedisQueuedLocks::Acquier::QueueInfo.queue_info(redis_client, lock_name)
+    RedisQueuedLocks::Acquirer::QueueInfo.queue_info(redis_client, lock_name)
   end
 
   # Retrun the current acquirer identifier.
@@ -760,7 +760,7 @@ def extend_lock_ttl(
     instr_sampler: config[:instr_sampler], # steep:ignore
     instr_sample_this: false
   )
-    RedisQueuedLocks::Acquier::ExtendLockTTL.extend_lock_ttl(
+    RedisQueuedLocks::Acquirer::ExtendLockTTL.extend_lock_ttl(
       redis_client,
       lock_name,
       milliseconds,
@@ -815,7 +815,7 @@ def clear_locks(
     instr_sampler: config[:instr_sampler], # steep:ignore
     instr_sample_this: false
   )
-    RedisQueuedLocks::Acquier::ReleaseAllLocks.release_all_locks(
+    RedisQueuedLocks::Acquirer::ReleaseAllLocks.release_all_locks(
       redis_client,
       batch_size,
       logger,
@@ -853,7 +853,7 @@ def clear_locks(
   # @api public
   # @since 1.0.0
   def locks(scan_size: config[:key_extraction_batch_size], with_info: false) # steep:ignore
-    RedisQueuedLocks::Acquier::Locks.locks(redis_client, scan_size:, with_info:)
+    RedisQueuedLocks::Acquirer::Locks.locks(redis_client, scan_size:, with_info:)
   end
 
   # Extracts lock keys with their info. See #locks(with_info: true) for details.
@@ -884,7 +884,7 @@ def locks_info(scan_size: config[:key_extraction_batch_size]) # steep:ignore
   # @api public
   # @since 1.0.0
   def queues(scan_size: config[:key_extraction_batch_size], with_info: false) # steep:ignore
-    RedisQueuedLocks::Acquier::Queues.queues(redis_client, scan_size:, with_info:)
+    RedisQueuedLocks::Acquirer::Queues.queues(redis_client, scan_size:, with_info:)
   end
 
   # Extracts lock queues with their info. See #queues(with_info: true) for details.
@@ -904,7 +904,7 @@ def queues_info(scan_size: config[:key_extraction_batch_size]) # steep:ignore
   # @api public
   # @since 1.0.0
   def keys(scan_size: config[:key_extraction_batch_size]) # steep:ignore
-    RedisQueuedLocks::Acquier::Keys.keys(redis_client, scan_size:)
+    RedisQueuedLocks::Acquirer::Keys.keys(redis_client, scan_size:)
   end
 
   # @option dead_ttl [Integer]
@@ -946,7 +946,7 @@ def clear_dead_requests(
     instr_sampler: config[:instr_sampler], # steep:ignore
     instr_sample_this: false
   )
-    RedisQueuedLocks::Acquier::ClearDeadRequests.clear_dead_requests(
+    RedisQueuedLocks::Acquirer::ClearDeadRequests.clear_dead_requests(
       redis_client,
       scan_size,
       dead_ttl,
diff --git a/lib/redis_queued_locks/utilities.rb b/lib/redis_queued_locks/utilities.rb
index dc8decb..3c3da8a 100644
--- a/lib/redis_queued_locks/utilities.rb
+++ b/lib/redis_queued_locks/utilities.rb
@@ -49,7 +49,6 @@ def run_non_critical(&block)
   #   - "blocking"
   #   - "running"
   #   - "terminated"
-  #   - "unknown"
   #
   # @param ractor [Ractor]
   # @return [String]
diff --git a/sig/redis_queued_locks.rbs b/sig/redis_queued_locks.rbs
index 81ba694..597d045 100644
--- a/sig/redis_queued_locks.rbs
+++ b/sig/redis_queued_locks.rbs
@@ -4,7 +4,7 @@ module RedisQueuedLocks
   end
 
   interface _Instrumentable
-    def notify: (::String event, ?::Hash[String|Symbol,untyped] payload) -> void
+    def notify: (::String event, ?::Hash[untyped,untyped] payload) -> void
   end
 
   extend ::RedisQueuedLocks::Debugger::Interface
diff --git a/sig/redis_queued_locks/acquier.rbs b/sig/redis_queued_locks/acquier.rbs
index b47c352..2487b06 100644
--- a/sig/redis_queued_locks/acquier.rbs
+++ b/sig/redis_queued_locks/acquier.rbs
@@ -1,4 +1,4 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
   end
 end
diff --git a/sig/redis_queued_locks/acquier/acquire_lock.rbs b/sig/redis_queued_locks/acquirer/acquire_lock.rbs
similarity index 77%
rename from sig/redis_queued_locks/acquier/acquire_lock.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock.rbs
index 5a9fe75..058ca68 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock.rbs
@@ -1,11 +1,11 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
-      extend ::RedisQueuedLocks::Acquier::AcquireLock::TryToLock
-      extend ::RedisQueuedLocks::Acquier::AcquireLock::DelayExecution
-      extend ::RedisQueuedLocks::Acquier::AcquireLock::YieldExpire
-      extend ::RedisQueuedLocks::Acquier::AcquireLock::WithAcqTimeout
-      extend ::RedisQueuedLocks::Acquier::AcquireLock::DequeueFromLockQueue
+      extend ::RedisQueuedLocks::Acquirer::AcquireLock::TryToLock
+      extend ::RedisQueuedLocks::Acquirer::AcquireLock::DelayExecution
+      extend ::RedisQueuedLocks::Acquirer::AcquireLock::YieldExpire
+      extend ::RedisQueuedLocks::Acquirer::AcquireLock::WithAcqTimeout
+      extend ::RedisQueuedLocks::Acquirer::AcquireLock::DequeueFromLockQueue
 
       def self.acquire_lock: (
         ::RedisClient redis,
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/delay_execution.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/delay_execution.rbs
similarity index 91%
rename from sig/redis_queued_locks/acquier/acquire_lock/delay_execution.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/delay_execution.rbs
index 55dcc4b..055ae5e 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/delay_execution.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/delay_execution.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module DelayExecution
         def delay_execution: (::Integer retry_delay, ::Integer retry_jitter) -> void
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue.rbs
similarity index 96%
rename from sig/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue.rbs
index 9cb04a9..4cfb1f8 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module DequeueFromLockQueue
         def dequeue_from_lock_queue: (
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue/log_visitor.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue/log_visitor.rbs
similarity index 96%
rename from sig/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue/log_visitor.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue/log_visitor.rbs
index 6d003f3..095552e 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/dequeue_from_lock_queue/log_visitor.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/dequeue_from_lock_queue/log_visitor.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module DequeueFromLockQueue
         module LogVisitor
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/instr_visitor.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/instr_visitor.rbs
similarity index 99%
rename from sig/redis_queued_locks/acquier/acquire_lock/instr_visitor.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/instr_visitor.rbs
index 2c51d09..0718c5d 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/instr_visitor.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/instr_visitor.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module InstrVisitor
         def self.extendable_reentrant_lock_obtained: (
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/log_visitor.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/log_visitor.rbs
similarity index 99%
rename from sig/redis_queued_locks/acquier/acquire_lock/log_visitor.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/log_visitor.rbs
index 620d551..d228648 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/log_visitor.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/log_visitor.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module LogVisitor
         def self.start_lock_obtaining: (
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/try_to_lock.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/try_to_lock.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/acquire_lock/try_to_lock.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/try_to_lock.rbs
index 1406212..f300756 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/try_to_lock.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/try_to_lock.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module TryToLock
         EXTEND_LOCK_PTTL: ::String
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/try_to_lock/log_visitor.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/try_to_lock/log_visitor.rbs
similarity index 99%
rename from sig/redis_queued_locks/acquier/acquire_lock/try_to_lock/log_visitor.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/try_to_lock/log_visitor.rbs
index a695a75..6c6d304 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/try_to_lock/log_visitor.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/try_to_lock/log_visitor.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module TryToLock
         module LogVisitor
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/with_acq_timeout.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/with_acq_timeout.rbs
similarity index 95%
rename from sig/redis_queued_locks/acquier/acquire_lock/with_acq_timeout.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/with_acq_timeout.rbs
index 0f26773..02b33c8 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/with_acq_timeout.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/with_acq_timeout.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module WithAcqTimeout
         def with_acq_timeout: (
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/yield_expire.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/yield_expire.rbs
similarity index 98%
rename from sig/redis_queued_locks/acquier/acquire_lock/yield_expire.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/yield_expire.rbs
index c0b1435..24f5ce5 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/yield_expire.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/yield_expire.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module YieldExpire
         DECREASE_LOCK_PTTL: ::String
diff --git a/sig/redis_queued_locks/acquier/acquire_lock/yield_with_expire/log_visitor.rbs b/sig/redis_queued_locks/acquirer/acquire_lock/yield_with_expire/log_visitor.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/acquire_lock/yield_with_expire/log_visitor.rbs
rename to sig/redis_queued_locks/acquirer/acquire_lock/yield_with_expire/log_visitor.rbs
index 014e5e5..24722a3 100644
--- a/sig/redis_queued_locks/acquier/acquire_lock/yield_with_expire/log_visitor.rbs
+++ b/sig/redis_queued_locks/acquirer/acquire_lock/yield_with_expire/log_visitor.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module AcquireLock
       module YieldExpire
         module LogVisitor
diff --git a/sig/redis_queued_locks/acquier/clear_dead_requests.rbs b/sig/redis_queued_locks/acquirer/clear_dead_requests.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/clear_dead_requests.rbs
rename to sig/redis_queued_locks/acquirer/clear_dead_requests.rbs
index e3e790f..12c749a 100644
--- a/sig/redis_queued_locks/acquier/clear_dead_requests.rbs
+++ b/sig/redis_queued_locks/acquirer/clear_dead_requests.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module ClearDeadRequests
       def self.clear_dead_requests: (
         ::RedisClient redis_client,
diff --git a/sig/redis_queued_locks/acquier/extend_lock_ttl.rbs b/sig/redis_queued_locks/acquirer/extend_lock_ttl.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/extend_lock_ttl.rbs
rename to sig/redis_queued_locks/acquirer/extend_lock_ttl.rbs
index 2e3646e..702fe72 100644
--- a/sig/redis_queued_locks/acquier/extend_lock_ttl.rbs
+++ b/sig/redis_queued_locks/acquirer/extend_lock_ttl.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module ExtendLockTTL
       EXTEND_LOCK_PTTL: ::String
 
diff --git a/sig/redis_queued_locks/acquier/is_locked.rbs b/sig/redis_queued_locks/acquirer/is_locked.rbs
similarity index 88%
rename from sig/redis_queued_locks/acquier/is_locked.rbs
rename to sig/redis_queued_locks/acquirer/is_locked.rbs
index ea50676..2b255b6 100644
--- a/sig/redis_queued_locks/acquier/is_locked.rbs
+++ b/sig/redis_queued_locks/acquirer/is_locked.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module IsLocked
       def self.locked?: (::RedisClient redis_client, ::String lock_name) -> bool
     end
diff --git a/sig/redis_queued_locks/acquier/is_queued.rbs b/sig/redis_queued_locks/acquirer/is_queued.rbs
similarity index 88%
rename from sig/redis_queued_locks/acquier/is_queued.rbs
rename to sig/redis_queued_locks/acquirer/is_queued.rbs
index 07c76b5..4cd65fd 100644
--- a/sig/redis_queued_locks/acquier/is_queued.rbs
+++ b/sig/redis_queued_locks/acquirer/is_queued.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module IsQueued
       def self.queued?: (::RedisClient redis_client, ::String lock_name) -> bool
     end
diff --git a/sig/redis_queued_locks/acquier/keys.rbs b/sig/redis_queued_locks/acquirer/keys.rbs
similarity index 89%
rename from sig/redis_queued_locks/acquier/keys.rbs
rename to sig/redis_queued_locks/acquirer/keys.rbs
index 64645c0..c3b89ce 100644
--- a/sig/redis_queued_locks/acquier/keys.rbs
+++ b/sig/redis_queued_locks/acquirer/keys.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module Keys
       def self.keys: (::RedisClient redis_client, scan_size: ::Integer) -> ::Set[::String]
     end
diff --git a/sig/redis_queued_locks/acquier/lock_info.rbs b/sig/redis_queued_locks/acquirer/lock_info.rbs
similarity index 92%
rename from sig/redis_queued_locks/acquier/lock_info.rbs
rename to sig/redis_queued_locks/acquirer/lock_info.rbs
index 7486f89..16a2e2b 100644
--- a/sig/redis_queued_locks/acquier/lock_info.rbs
+++ b/sig/redis_queued_locks/acquirer/lock_info.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module LockInfo
       def self.lock_info: (
         ::RedisClient redis_client,
diff --git a/sig/redis_queued_locks/acquier/locks.rbs b/sig/redis_queued_locks/acquirer/locks.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/locks.rbs
rename to sig/redis_queued_locks/acquirer/locks.rbs
index 9773583..aa6e398 100644
--- a/sig/redis_queued_locks/acquier/locks.rbs
+++ b/sig/redis_queued_locks/acquirer/locks.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module Locks
       def self.locks: (
         ::RedisClient redis_client,
diff --git a/sig/redis_queued_locks/acquier/queue_info.rbs b/sig/redis_queued_locks/acquirer/queue_info.rbs
similarity index 93%
rename from sig/redis_queued_locks/acquier/queue_info.rbs
rename to sig/redis_queued_locks/acquirer/queue_info.rbs
index a605f59..41a18b9 100644
--- a/sig/redis_queued_locks/acquier/queue_info.rbs
+++ b/sig/redis_queued_locks/acquirer/queue_info.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module QueueInfo
       def self.queue_info: (
         ::RedisClient redis_client,
diff --git a/sig/redis_queued_locks/acquier/queues.rbs b/sig/redis_queued_locks/acquirer/queues.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/queues.rbs
rename to sig/redis_queued_locks/acquirer/queues.rbs
index 66f1587..52bce6a 100644
--- a/sig/redis_queued_locks/acquier/queues.rbs
+++ b/sig/redis_queued_locks/acquirer/queues.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module Queues
       def self.queues: (
         ::RedisClient redis_client,
diff --git a/sig/redis_queued_locks/acquier/release_all_locks.rbs b/sig/redis_queued_locks/acquirer/release_all_locks.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/release_all_locks.rbs
rename to sig/redis_queued_locks/acquirer/release_all_locks.rbs
index 2653005..feeb1c8 100644
--- a/sig/redis_queued_locks/acquier/release_all_locks.rbs
+++ b/sig/redis_queued_locks/acquirer/release_all_locks.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module ReleaseAllLocks
       extend ::RedisQueuedLocks::Utilities
 
diff --git a/sig/redis_queued_locks/acquier/release_lock.rbs b/sig/redis_queued_locks/acquirer/release_lock.rbs
similarity index 97%
rename from sig/redis_queued_locks/acquier/release_lock.rbs
rename to sig/redis_queued_locks/acquirer/release_lock.rbs
index 5488d04..859b535 100644
--- a/sig/redis_queued_locks/acquier/release_lock.rbs
+++ b/sig/redis_queued_locks/acquirer/release_lock.rbs
@@ -1,5 +1,5 @@
 module RedisQueuedLocks
-  module Acquier
+  module Acquirer
     module ReleaseLock
       extend ::RedisQueuedLocks::Utilities
 
diff --git a/sig/redis_queued_locks/logging/void_logger.rbs b/sig/redis_queued_locks/logging/void_logger.rbs
index bbe7f52..3cb2a6a 100644
--- a/sig/redis_queued_locks/logging/void_logger.rbs
+++ b/sig/redis_queued_locks/logging/void_logger.rbs
@@ -8,7 +8,7 @@ module RedisQueuedLocks
       def self.error: (?untyped? progname) { (?) -> untyped } -> nil
       def self.fatal: (?untyped? progname) { (?) -> untyped } -> nil
       def self.debug: (?untyped? progname) { (?) -> untyped } -> nil
-       def self.add: (?untyped? severity, ?untyped? message, ?untyped? progname) { (?) -> untyped } -> nil
+      def self.add: (?untyped? severity, ?untyped? message, ?untyped? progname) { (?) -> untyped } -> nil
       def self.<<: (untyped message) -> nil
     end
   end