diff --git a/src/features/impl_alloc.rs b/src/features/impl_alloc.rs
index 2a37ce72..3d65671d 100644
--- a/src/features/impl_alloc.rs
+++ b/src/features/impl_alloc.rs
@@ -266,7 +266,7 @@ where
         if unty::type_equal::<T, u8>() {
             decoder.claim_container_read::<T>(len)?;
             // optimize for reading u8 vecs
-            let mut vec = alloc::vec![0u8; len];
+            let mut vec = alloc::vec::from_elem(0u8, len);
             decoder.reader().read(&mut vec)?;
             // Safety: Vec<T> is Vec<u8>
             Ok(unsafe { core::mem::transmute(vec) })
@@ -630,6 +630,7 @@ where
     }
 }
 
+#[cfg(not(feature = "unstable-strict-oom-checks"))]
 /// A drop guard that will trigger when an item fails to decode.
 /// If an item at index n fails to decode, we have to properly drop the 0..(n-1) values that have been read.
 struct DropGuard<'a, T> {
@@ -637,6 +638,7 @@ struct DropGuard<'a, T> {
     idx: usize,
 }
 
+#[cfg(not(feature = "unstable-strict-oom-checks"))]
 impl<'a, T> Drop for DropGuard<'a, T> {
     fn drop(&mut self) {
         unsafe {
diff --git a/src/lib.rs b/src/lib.rs
index 2ac669cb..db8b59a8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -100,7 +100,6 @@ pub mod de;
 pub mod enc;
 pub mod error;
 
-pub use atomic::*;
 pub use de::{BorrowDecode, Decode};
 pub use enc::Encode;
 
diff --git a/src/varint/decode_unsigned.rs b/src/varint/decode_unsigned.rs
index de0f0b95..ea2091d6 100644
--- a/src/varint/decode_unsigned.rs
+++ b/src/varint/decode_unsigned.rs
@@ -1,11 +1,10 @@
-use core::{convert::TryInto, u32};
-
 use super::{SINGLE_BYTE_MAX, U128_BYTE, U16_BYTE, U32_BYTE, U64_BYTE};
 use crate::{
     config::Endianness,
     de::read::Reader,
     error::{DecodeError, IntegerType},
 };
+use core::u32;
 
 #[inline(never)]
 #[cold]