Fix bug where Mac will fail to parse very small floats #941
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…s represented in scientific-notation.
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Improve Mac/Windows consistency in parsing very small and large floats represented in scientific-notation.
The original "strtofloatval()" function defined in "lib/lexer.lxx" exhibited different behavior on Windows vs Mac. On Windows (Windows 11, Intel) floating point values such as "4.94065645841247e-324" returned "true". On Mac (Sequoia 15.5, M3 Max) the same floating point value returned "false".
This PR replaces the inconsistent behavior of the original numerical parser "std::istringstream iss(s)" with "std::strtod".