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3f78683353
This is required by the Standard and makes it possible to add full 128-bit support to format. The patch also fixes 128-bit from_chars "support". One unit test required a too large value, this failed on 128-bit; the fix was to add more characters to the input. Note only base 10 has been optimized. Other bases can be optimized. Note the 128-bit lookup table could be made smaller. This will be done later. I really want to get 128-bit working in to_chars and format in the upcomming LLVM 15 release, these optimizations aren't critical. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D128929