[issue2690] Precompute range length

[Facundo Batista]

Facundo Batista <facundo at taniquetil.com.ar> added the comment:

My 2 cents: for me is more useful to have a unbound range() than to be
able to do a len() on it.

For me, range() should mimic a number generator: no limit, no length.

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nosy: +facundobatista

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