[Issue 16209] std.string.isNumeric can work with forward ranges

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16209

--- Comment #6 from Andrei Alexandrescu <andrei at erdani.com> ---
(In reply to Jack Stouffer from comment #5)
> I doubt that parse can handle all of the esoteric inputs that isNumeric can
> handle right now.

That's part of the problem. There's very little use of a function that tells
you something is numeric, that is not complemented by a function that tells you
what the actual number is.

This function is inspired from scripting languages that need it for logic such
as "if it looks like a number, consider it a number". Has no place in D.

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