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With JSON_STRICT_NUL_HANDLING defined to 1, parsing a wide, UTF-16, UTF-32, or (C++20) UTF-8 string literal (e.g. json::parse(L"[1]")) failed with parse_error.101 at the terminating NUL of the literal, and accept() returned false. The array overload of input_adapter() only dropped the compiler-added trailing '\0' for arrays of char, so for wchar_t, char16_t, char32_t, and char8_t arrays that terminator was passed to the parser as data, which the macro then rejected. Broaden the trimming to every character type that a string literal can use (char, wchar_t, char16_t, char32_t, and, since C++20, char8_t). Arrays of any other element type (unsigned char, std::uint8_t, ...), as used for CBOR/MessagePack, are unaffected: a trailing zero byte there is still read as genuine data. Fixes #5658. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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