cereal is:exact

package cereal
Uses
A binary serialization library A binary serialization library, similar to binary, that introduces an isolate primitive for parser isolation, and labeled blocks for better error messages.
cereal :: (Serialize a, Monad m, InputParsing m, ParserInput m ~ ByteString, Applicative n) => Format m n ByteString a
construct Construct
A quick way to format a value that already has an appropriate Serialize instance 
>>> testParse (cereal @Word16) (ByteString.pack [1,2,3])
Right [(258,"\ETX")]

>>> testSerialize cereal (1025 :: Word16)
Right "\EOT\SOH"