Re: how about toEngineering and toHexExponential formats for Number

[Roger Andrews]

Following on from Number.prototype.toHexExponential, it would be nice if 
parseFloat could then convert this format back to Number.

And parseFloat should ignore a "0x" or "0X" between the leading sign (if 
any) and the main string.
E.g.  "-0x123.B4p+12"

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