Fuzz

Fix handling of trailing 0 in fixed format to_chars with unspecified precision #648

Job	Run time
posix (clang, clang++-12, 14,17,20, ubuntu-22.04, clang-12)	16m 57s
posix (clang, clang++-13, 14,17,20, ubuntu-22.04, clang-13)	15m 4s
posix (clang, clang++-14, 14,17,20, ubuntu-22.04, clang-14)	13m 5s
posix (clang, clang++-14, 14-gnu,17-gnu,20-gnu, ubuntu-22.04, clang-14)	15m 17s
posix (clang, clang++-15, 14,17,20, ubuntu-22.04, clang-15, deb http://apt.llvm.org/jammy/ llvm-t...	12m 20s
posix (clang, clang++-16, 14,17,20, ubuntu-22.04, clang-16, deb http://apt.llvm.org/jammy/ llvm-t...	14m 53s
posix (clang, clang++-17, 14,17,20, ubuntu-22.04, clang-17, deb http://apt.llvm.org/jammy/ llvm-t...	13m 35s
posix (clang, clang++-18, 14,17,20,23, ubuntu-24.04, clang-18, deb http://apt.llvm.org/noble/ llv...	18m 25s
posix (clang, clang++-19, 14,17,20,23, ubuntu-24.04, clang-19, deb http://apt.llvm.org/noble/ llv...	17m 14s
	2h 16m 50s

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