diff --git a/build-resources/opaque-types/src/lib.rs b/build-resources/opaque-types/src/lib.rs
index 563e7b7ec..5c2740623 100644
--- a/build-resources/opaque-types/src/lib.rs
+++ b/build-resources/opaque-types/src/lib.rs
@@ -112,7 +112,7 @@ get_opaque_type_data!(Option<Reply>, z_owned_reply_t);
 /// A loaned reply.
 get_opaque_type_data!(Reply, z_loaned_reply_t);
 
-/// A Zenoh reply error a compination of reply error payload and its encoding.
+/// A Zenoh reply error - a combination of reply error payload and its encoding.
 get_opaque_type_data!(ReplyError, z_owned_reply_err_t);
 /// A loaned Zenoh reply error.
 get_opaque_type_data!(ReplyError, z_loaned_reply_err_t);
diff --git a/docs/api.rst b/docs/api.rst
index fd2b72f44..153b1c928 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -188,6 +188,7 @@ Functions
 
 .. doxygenfunction:: z_keyexpr_loan
 .. doxygenfunction:: z_view_keyexpr_loan
+.. doxygenfunction:: z_keyexpr_clone
 .. doxygenfunction:: z_keyexpr_drop
 
 .. doxygenfunction:: z_keyexpr_as_view_string
@@ -305,6 +306,7 @@ Functions
 .. doxygenfunction:: z_reply_err_encoding
 
 .. doxygenfunction:: z_reply_err_loan
+.. doxygenfunction:: z_reply_err_clone
 .. doxygenfunction:: z_reply_err_drop
 
 Sample
@@ -475,8 +477,6 @@ Functions
 .. doxygenfunction:: z_session_loan
 .. doxygenfunction:: z_session_drop
 
-.. doxygenfunction:: z_session_clone
-
 .. doxygenfunction:: z_info_zid
 .. doxygenfunction:: z_info_routers_zid
 .. doxygenfunction:: z_info_peers_zid
diff --git a/include/zenoh_commons.h b/include/zenoh_commons.h
index 1f59bfa0a..2e257cbe1 100644
--- a/include/zenoh_commons.h
+++ b/include/zenoh_commons.h
@@ -3205,6 +3205,12 @@ z_result_t z_keyexpr_canonize(char *start,
  */
 ZENOHC_API
 z_result_t z_keyexpr_canonize_null_terminated(char *start);
+/**
+ * Constructs a copy of the key expression.
+ */
+ZENOHC_API
+void z_keyexpr_clone(struct z_owned_keyexpr_t *dst,
+                     const struct z_loaned_keyexpr_t *this_);
 /**
  * Constructs key expression by concatenation of key expression in `left` with a string in `right`.
  * Returns 0 in case of success, negative error code otherwise.
@@ -3716,6 +3722,12 @@ ZENOHC_API void z_reply_drop(struct z_moved_reply_t *this_);
  * Returns `NULL` if reply does not contain a error  (i. e. if `z_reply_is_ok` returns ``true``).
  */
 ZENOHC_API const struct z_loaned_reply_err_t *z_reply_err(const struct z_loaned_reply_t *this_);
+/**
+ * Constructs a copy of the reply error message.
+ */
+ZENOHC_API
+void z_reply_err_clone(struct z_owned_reply_err_t *dst,
+                       const struct z_loaned_reply_err_t *this_);
 /**
  * Frees the memory and resets the reply error it to its default value.
  */
@@ -3946,16 +3958,8 @@ z_result_t z_scout(struct z_moved_config_t *config,
  * Constructs the default values for the scouting operation.
  */
 ZENOHC_API void z_scout_options_default(struct z_scout_options_t *this_);
-/**
- * Constructs an owned shallow copy of the session in provided uninitialized memory location.
- */
-ZENOHC_API
-void z_session_clone(struct z_owned_session_t *dst,
-                     const struct z_loaned_session_t *this_);
 /**
  * Frees memory and invalidates the session.
- *
- * This will also close the session if it does not have any clones left.
  */
 ZENOHC_API void z_session_drop(struct z_moved_session_t *this_);
 /**
diff --git a/src/get.rs b/src/get.rs
index 788a57028..da5fc9dc4 100644
--- a/src/get.rs
+++ b/src/get.rs
@@ -12,21 +12,16 @@
 //   ZettaScale Zenoh team, <zenoh@zettascale.tech>
 //
 
-use std::{
-    ffi::CStr,
-    mem::MaybeUninit,
-    ops::{Deref, DerefMut},
-    ptr::null,
-};
+use std::{ffi::CStr, mem::MaybeUninit, ptr::null};
 
 use libc::c_char;
 use zenoh::{
-    bytes::{Encoding, ZBytes},
     qos::{CongestionControl, Priority},
     query::{ConsolidationMode, QueryConsolidation, QueryTarget, Reply, ReplyError, Selector},
     Wait,
 };
 
+pub use crate::opaque_types::{z_loaned_reply_err_t, z_moved_reply_err_t, z_owned_reply_err_t};
 use crate::{
     result,
     transmute::{LoanedCTypeRef, RustTypeRef, RustTypeRefUninit, TakeRustType},
@@ -40,45 +35,15 @@ use crate::{
     transmute::IntoCType, z_id_t, z_moved_source_info_t, zc_locality_default, zc_locality_t,
     zc_reply_keyexpr_default, zc_reply_keyexpr_t,
 };
-
-// we need to add Default to ReplyError
-#[repr(transparent)]
-pub(crate) struct ReplyErrorNewtype(ReplyError);
-impl Default for ReplyErrorNewtype {
-    fn default() -> Self {
-        Self(zenoh::internal::Value::new(ZBytes::empty(), Encoding::default()).into())
-    }
-}
-impl Deref for ReplyErrorNewtype {
-    type Target = ReplyError;
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-impl DerefMut for ReplyErrorNewtype {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
-    }
-}
-impl From<&ReplyError> for &ReplyErrorNewtype {
-    fn from(value: &ReplyError) -> Self {
-        // SAFETY: ReplyErrorNewtype is repr(transparent) to ReplyError
-        unsafe { core::mem::transmute::<&ReplyError, Self>(value) }
-    }
-}
-
-pub use crate::opaque_types::{z_loaned_reply_err_t, z_moved_reply_err_t, z_owned_reply_err_t};
 decl_c_type!(
-    owned(z_owned_reply_err_t, ReplyErrorNewtype),
-    loaned(z_loaned_reply_err_t, ReplyErrorNewtype),
+    owned(z_owned_reply_err_t, ReplyError),
+    loaned(z_loaned_reply_err_t, ReplyError),
 );
 
 /// Constructs an empty `z_owned_reply_err_t`.
 #[no_mangle]
 pub extern "C" fn z_internal_reply_err_null(this_: &mut MaybeUninit<z_owned_reply_err_t>) {
-    this_
-        .as_rust_type_mut_uninit()
-        .write(ReplyErrorNewtype::default());
+    this_.as_rust_type_mut_uninit().write(ReplyError::default());
 }
 
 /// Returns ``true`` if reply error is in non-default state, ``false`` otherwise.
@@ -145,7 +110,7 @@ pub unsafe extern "C" fn z_reply_ok(this_: &z_loaned_reply_t) -> *const z_loaned
 pub unsafe extern "C" fn z_reply_err(this_: &z_loaned_reply_t) -> *const z_loaned_reply_err_t {
     match this_.as_rust_type_ref().result() {
         Ok(_) => null(),
-        Err(v) => std::convert::Into::<&ReplyErrorNewtype>::into(v).as_loaned_c_type_ref(),
+        Err(v) => v.as_loaned_c_type_ref(),
     }
 }
 
@@ -404,3 +369,13 @@ pub extern "C" fn z_query_consolidation_monotonic() -> z_query_consolidation_t {
 pub extern "C" fn z_query_consolidation_none() -> z_query_consolidation_t {
     QueryConsolidation::from(ConsolidationMode::None).into()
 }
+
+/// Constructs a copy of the reply error message.
+#[no_mangle]
+extern "C" fn z_reply_err_clone(
+    dst: &mut MaybeUninit<z_owned_reply_err_t>,
+    this: &z_loaned_reply_err_t,
+) {
+    dst.as_rust_type_mut_uninit()
+        .write(this.as_rust_type_ref().clone());
+}
diff --git a/src/keyexpr.rs b/src/keyexpr.rs
index fb747909c..c5e265043 100644
--- a/src/keyexpr.rs
+++ b/src/keyexpr.rs
@@ -646,3 +646,10 @@ pub extern "C" fn z_keyexpr_relation_to(
     let r = right.as_rust_type_ref();
     l.relation_to(r).into()
 }
+
+/// Constructs a copy of the key expression.
+#[no_mangle]
+extern "C" fn z_keyexpr_clone(dst: &mut MaybeUninit<z_owned_keyexpr_t>, this: &z_loaned_keyexpr_t) {
+    dst.as_rust_type_mut_uninit()
+        .write(Some(this.as_rust_type_ref().clone()));
+}
diff --git a/src/session.rs b/src/session.rs
index 007343bed..fc1130d11 100644
--- a/src/session.rs
+++ b/src/session.rs
@@ -147,20 +147,7 @@ pub extern "C" fn z_close(session: &mut z_moved_session_t) -> result::z_result_t
 }
 
 /// Frees memory and invalidates the session.
-///
-/// This will also close the session if it does not have any clones left.
 #[no_mangle]
 pub extern "C" fn z_session_drop(this_: &mut z_moved_session_t) {
     let _ = this_.take_rust_type();
 }
-
-/// Constructs an owned shallow copy of the session in provided uninitialized memory location.
-#[allow(clippy::missing_safety_doc)]
-#[no_mangle]
-pub extern "C" fn z_session_clone(
-    dst: &mut MaybeUninit<z_owned_session_t>,
-    this: &z_loaned_session_t,
-) {
-    dst.as_rust_type_mut_uninit()
-        .write(Some(this.as_rust_type_ref().clone()));
-}