Fix rare invalid output in float to string conversion #559

Job	Run time
Install Ubuntu GCC static Release	14s
Install Ubuntu GCC header-only Release	14s
Install Ubuntu GCC shared Release	12s
Ubuntu GCC Release	1m 53s
Ubuntu GCC Debug	1m 22s
Ubuntu GCC noexcept Release	1m 2s
Ubuntu GCC noexcept Debug	44s
Ubuntu GCC notime Release	1m 14s
Ubuntu GCC notime Debug	52s
Ubuntu GCC nounity Release	1m 20s
Ubuntu GCC nounity Debug	50s
Ubuntu GCC header-only Release	1m 13s
Ubuntu GCC header-only Debug	52s
Ubuntu GCC shared Release	1m 15s
Ubuntu GCC shared Debug	50s
Ubuntu Clang Release	1m 19s
Ubuntu Clang Debug	57s
Ubuntu Clang noexcept Release	1m 12s
Ubuntu Clang noexcept Debug	47s
Windows 32 Release	2m 53s
Windows 32 Debug	2m 2s
Windows 64 Release	1m 32s
Windows 64 Debug	1m 46s
Windows 64 noexcept Release	1m 14s
Windows 64 noexcept Debug	1m 37s
Windows 64 shared Release	1m 24s
Windows 64 shared Debug	1m 49s
MacOS Release	38s
MacOS Debug	28s
MacOS noexcept Release	34s
MacOS noexcept Debug	27s
WebAssembly Release	47s
WebAssembly Debug	52s
WebAssembly noexcept Release	7m 36s
WebAssembly noexcept Debug	43s
	44m 44s

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