I wish Javascript, etc. had hexadecimal floats. It’s annoying to worry about whether different implementations might parse your numbers differently, worrying about whether you need to write down 15 or 17 decimal digits, ...
Often the numbers (e.g. coefficients of some degree 10 polynomial approximation of a special function) are not intended to be human-readable anyway. Such values were typically computed in binary in the first place, and the only place they ever need to be decimal is when written into the code, where they will be immediately reconverted to binary numbers for use.
I mean, it's not too difficult to add them. You can parse, shove your result into a data view, Uint32Array, or whatever, then turn that into a Float64Array.
Often the numbers (e.g. coefficients of some degree 10 polynomial approximation of a special function) are not intended to be human-readable anyway. Such values were typically computed in binary in the first place, and the only place they ever need to be decimal is when written into the code, where they will be immediately reconverted to binary numbers for use.