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Document MessagePack ext types and fix related doc errors (#5928)

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* Document MessagePack ext types and fix related doc errors

Add an "Extension types (ext, fixext)" section to the MessagePack page:
ext/fixext are read as binary, the signed ext type is exposed as an
unsigned subtype 0..255 (-1 reads as 255), Timestamp is not interpreted,
subtypes are always written as ext/fixext, and subtypes above 255 throw
out_of_range.415. Add the 0xC1 row to the deserialization table, note
that duplicate keys keep the last value, and correct the NaN/Infinity
explanation, the "31 bytes / 15 elements" wording, the ill-formed UTF-8
sentence, and the generic 0xC1-key error message.

Add fixext16 and the unsigned subtype mapping to binary_t.md and
binary_values.md, reword "maximum of the MessagePack ext type" in
to_msgpack.md and exceptions.md, and mark MessagePack deserialization
as incomplete (non-string keys) in the binary formats overview.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Address review of the MessagePack documentation

Name parse_error.113 for a 0xC1 map key, move the duplicate-key sentence out of the ext section, and keep the 0xC1 row in marker order.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-10-26 18:25:44 +01:00
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docs/mkdocs/docs/features/binary_formats/index.md
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@@ -22,7 +22,7 @@ to efficiently encode JSON values to byte vectors and to decode such vectors.
| BON8 | incomplete: no unsigned integers above int64 | complete |
| BSON | incomplete: top-level value must be an object | incomplete, but all JSON types are supported |
| CBOR | complete | incomplete, but all JSON types are supported |
| MessagePack | complete | complete |
| MessagePack | complete | incomplete, but all JSON types are supported |
| UBJSON | complete | complete |
### Binary values