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Niels Lohmann
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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>
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