The fields were already typed as MediaTypeToken / ParsePath, but a
tolerant __post_init__ coerced raw strings into their enum form. With
MediaTypeToken(str, Enum) (and ParsePath idem), the coercion served no
purpose — callers that pass '.value' got back the enum anyway, and
callers that pass an unknown string got a ValidationError just like
they would now.
Strict mode: constructor rejects non-enum values directly. The two
in-tree builders (parse_release() and the parser pipeline) already
produce enum values; all .value sites have been removed. Drops the
unused _VALID_MEDIA_TYPES / _VALID_PARSE_PATHS lookup tables.
francwa
757e4045ee