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Clarify msgspec.Raw unsupported with yaml/toml decode - #1170
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When convert targets msgspec.Raw but the input is an already-parsed Python object (as with yaml/toml decode), raise a clear ValidationError instead of a confusing "Expected `any`, got `int`" message. Document that delayed decoding with Raw requires json or msgpack. Fixes msgspec#1136
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Summary
ValidationErrorwhenconverttargetsmsgspec.Rawbut receives an already-parsed Python object (as happens withyaml.decode/toml.decode)msgspec.Rawrequires the nativejsonormsgpackdecodersFixes #1136
Root cause
msgspec.Rawrequires substrings of the original serialized bytes. The nativejsonandmsgpackdecoders capture these via*_decode_raw(). Theyamlandtomlmodules parse messages fully with PyYAML/tomllib before callingconvert, so the original byte spans are unavailable.Previously,
convertdispatched on the source Python type and produced a confusing error likeExpected \any`, got `int``.Test plan
test_raw_from_parsed_object_errorintest_convert.pytest_decode_raw_field_unsupportedintest_yaml.py