Replace *errors.errorString
with InadmissibleTagContentTypeError
#552
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Closes #551
Currently *errors.errorString is returned when unmarshalling built-in tags (tag 0-3 and 21-23) with inadmissible content type.
This PR adds
InadmissibleTagContentTypeError
and returns it (instead of*errors.errorString
) for inadmissible type for tag content.For compatibility,
InadmisibleTagContentTypeError
returns the same error message as before when unmarshalling build-in tags with inadmissible content type.See "Tag validity" in RFC 8949 Section 5.3.2 for more about "inadmissible type for tag content".