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RFC 8949 and the MessagePack/BSON/UBJSON/BJData specs leave UTF-8 well-formedness checking up to the decoder, so following #5529 the binary readers are lenient by default again, as in release 3.12.0 (the reader-side check was added by #5185/#5531, not in any release); reader-side validation becomes opt-in in a follow-up PR. The writers stay strict and throw type_error.316 for ill-formed UTF-8. BON8 is unchanged, since UTF-8 lead bytes are structural there. Signed-off-by: Niels Lohmann <mail@nlohmann.me>