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Claude
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PR #5531 fixed the UTF-8-validation gap described in #5529, but it was merged onto the still-unmerged bson-sizes branch rather than develop, so develop was left with the original bug for all affected formats. A follow-up comment on #5529 reproduced this on develop and additionally found that UBJSON (and, by the same code path, BJData) has the identical gap, undocumented. Port the same fix directly onto develop: extract the UTF-8 DFA decoder out of serializer<>::decode() into a shared detail::decode()/is_valid_utf8() in string_utils.hpp, and call it from binary_reader::get_string() - the single choke point shared by all five binary readers - so malformed text strings are rejected at decode time (parse_error.113) instead of only failing later on dump() (type_error.316). Byte/binary payloads are unaffected. Add matching decode-time tests for CBOR, MessagePack, BSON, UBJSON, and BJData, and document the new behavior on all five binary format pages (the two UBJSON/BJData pages didn't get this note in #5531). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017sdieJCn6BHxzRMaXP49sP