pub(crate) fn reject_maybe_in_signature_str(bytes: &[u8]) -> Result<()>Expand description
Reject a maybe type in a signature carried as a g or v value’s string form.
This is the hot path (every variant on the wire), so it avoids re-parsing the string into a
Signature: m is the maybe type constructor and appears nowhere else in the signature
grammar, so its presence is an exact test for a maybe type.