move benchmarks to iai-callgrind

src/endianness.rs

@@ -1,5 +1,5 @@
 /// Trait for specifying endianness of bit buffer
-pub trait Endianness: private::Sealed {
+pub trait Endianness: private::Sealed + Copy {
     /// Get the endianness as string, either LittleEndian or BigEndian
     fn as_string() -> &'static str {
         if Self::is_le() {

src/readbuffer.rs

@@ -123,7 +123,7 @@ where
     /// ];
     /// let buffer = BitReadBuffer::new(&bytes, LittleEndian);
     /// ```
-    pub fn new(bytes: &'a [u8], _endianness: E) -> Self {
+    pub const fn new(bytes: &'a [u8], _endianness: E) -> Self {
         let byte_len = bytes.len();
 
         BitReadBuffer {