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Niels Lohmann
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* Name the key type when rejecting non-string CBOR/MessagePack map keys CBOR and MessagePack allow map keys of any type, but JSON object keys are always strings, so such maps are rejected. The error so far was the one for a malformed string (e.g. "expected length specification (0xA0-0xBF, 0xD9-0xDB); last byte: 0xC0" for a nil key), which does not tell the user what went wrong. Report the type of the key instead: syntax error while parsing MessagePack object key: only string keys are supported, but found nil; last byte: 0xC0 The exception id (parse_error.113) and type are unchanged. Malformed string keys and a missing key keep their previous messages. Document the restriction on the CBOR and MessagePack pages. Refs #2766, #3381 Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Point the MessagePack key note to the spec's profile section The note linked to "Serialization: type to format conversion", which says nothing about key types. Restricting map keys to strings is only mentioned in the "Profile" section (under "Future discussion") as an example of a JSON-compatible profile, so link there and describe it as such instead of as a permission. Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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