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* Skip integer conversion in accept()/SAX validation when the value is unused lexer::scan_number() always converted every numeric token with strtoull()/strtoll() before returning, even though accept() (and any consumer using json_sax_acceptor) immediately discards the converted value. For value_unsigned/value_integer tokens whose digit count already guarantees the value fits into 64 bits, the conversion cannot change the accept/reject decision (such tokens are always finite and unconditionally accepted), so scan_number() can skip strtoull()/ strtoll() entirely in that case when the caller signals it does not need the value. Numbers with more digits keep using the exact, unmodified conversion path, so overflow reclassification to value_float (and the finiteness check on it) is unaffected. parse() and value_float handling are completely unchanged. Fixes #5411 Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Document why the digit-count fast path is safe regardless of number_unsigned_t/number_integer_t width Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Avoid temporary-string concatenation flagged by clang-tidy in the differential test Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>