Parse "nan(n-char-seq-opt)" as required by C++17 20.19.3.7 #61
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Parse "nan(n-char-seq-opt)" as required by C++17 20.19.3.7 and C11 7.20.1.3.3.
At least MSVC produces nan(ind) and nan(snan), and according to https://reviews.llvm.org/D70631 MSVC implementation seems to became LLVM std::to_chars().
float => string => float roundtripping was tested for all floats on macOS with custom "charconv" header that includes https://reviews.llvm.org/D70631 patch that added std::to_chars(... float/double ...) capability.