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f793be7871
Cast ptrdiff_t to size_t to avoid a -Wsign-compare warning. We can check in __to_chars_i that the ptrdiff_t won't be negative, so that we know the cast is safe. libstdc++-v3/ChangeLog: * include/std/charconv (__to_chars_16, __to_chars_10) (__to_chars_8, __to_chars_2, __to_chars): Cast ptrdiff_t to size_t for comparison. (__to_chars_i): Check for first >= last instead of first == last for initial sanity check.