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2010/1/14 Ignacio Burgueño <>:
> But I can't think of a case where the length of something is not a numeric
> value.
> For me, __len has clear semantics. The length of something is measurable in
> 'n' units, with 'n' being a number.
> Using __len for other uses seems like a case of operator overloading abuse
> (C++).

I can think of a pretty high-profile example of this - Roberto's LPEG
library overloads the # operator for LPEG pattern objects for
something entirely unrelated to length (it "returns" a new pattern).