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Niels Lohmann
c386d0c641
A BON8 string ends at the first byte that cannot continue it. When a
string ends a value and is not terminated by 0xFF, that byte belongs to
whatever follows the value, but the reader has already taken it from the
input and keeps it in its push-back buffer. With strict = true the
end-of-input check reports it; with strict = false the buffer was
discarded, so a following value in a stream lost its first byte or bytes
without an error ({0x61, 0x90} read "a" and then dropped the 0 that
follows).
Report parse_error.110 "string at the end of the value is not terminated
by 0xFF" when the push-back buffer is not empty once a BON8 value is
complete and strict is false, as bon8.md requires the final 0xFF. Output
of to_bon8 always has it, so canonical input is not affected.
Fixes #6110.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>