diff --git a/Cargo.toml b/Cargo.toml
index 4db5d26..c2670d3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "base64"
-version = "0.21.7"
+version = "0.22.0"
 authors = ["Alice Maz <alice@alicemaz.com>", "Marshall Pierce <marshall@mpierce.org>"]
 description = "encodes and decodes base64 as bytes or utf8"
 repository = "https://github.com/marshallpierce/rust-base64"
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 0031215..46e281e 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -1,3 +1,9 @@
+# 0.22.0
+
+- `DecodeSliceError::OutputSliceTooSmall` is now conservative rather than precise. That is, the error will only occur if the decoded output _cannot_ fit, meaning that `Engine::decode_slice` can now be used with exactly-sized output slices. As part of this, `Engine::internal_decode` now returns `DecodeSliceError` instead of `DecodeError`, but that is not expected to affect any external callers.
+- `DecodeError::InvalidLength` now refers specifically to the _number of valid symbols_ being invalid (i.e. `len % 4 == 1`), rather than just the number of input bytes. This avoids confusing scenarios when based on interpretation you could make a case for either `InvalidLength` or `InvalidByte` being appropriate.
+- Decoding is somewhat faster (5-10%)
+
 # 0.21.7
 
 - Support getting an alphabet's contents as a str via `Alphabet::as_str()`
diff --git a/src/engine/general_purpose/decode.rs b/src/engine/general_purpose/decode.rs
index 98ce043..b55d3fc 100644
--- a/src/engine/general_purpose/decode.rs
+++ b/src/engine/general_purpose/decode.rs
@@ -348,7 +348,10 @@ mod tests {
                 let len_128 = encoded_len as u128;
 
                 let estimate = GeneralPurposeEstimate::new(encoded_len);
-                assert_eq!((len_128 + 3) / 4 * 3, estimate.conservative_decoded_len as u128);
+                assert_eq!(
+                    (len_128 + 3) / 4 * 3,
+                    estimate.conservative_decoded_len as u128
+                );
             })
     }
 }
diff --git a/src/engine/naive.rs b/src/engine/naive.rs
index 15c07cc..af509bf 100644
--- a/src/engine/naive.rs
+++ b/src/engine/naive.rs
@@ -112,8 +112,12 @@ impl Engine for Naive {
         output: &mut [u8],
         estimate: Self::DecodeEstimate,
     ) -> Result<DecodeMetadata, DecodeSliceError> {
-        let complete_nonterminal_quads_len =
-            general_purpose::decode::complete_quads_len(input, estimate.rem, output.len(), &self.decode_table)?;
+        let complete_nonterminal_quads_len = general_purpose::decode::complete_quads_len(
+            input,
+            estimate.rem,
+            output.len(),
+            &self.decode_table,
+        )?;
 
         const BOTTOM_BYTE: u32 = 0xFF;
 
diff --git a/src/lib.rs b/src/lib.rs
index 6b5cccb..579a722 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -228,7 +228,7 @@
     unused_extern_crates,
     unused_import_braces,
     unused_results,
-    variant_size_differences,
+    variant_size_differences
 )]
 #![forbid(unsafe_code)]
 // Allow globally until https://github.com/rust-lang/rust-clippy/issues/8768 is resolved.