[ruby-core:61130] [Backport21 - Backport #9575] Step with 0 step is buggy

Issue #9575 has been updated by Marc-Andre Lafortune.

Tracker changed from Bug to Backport
Project changed from ruby-trunk to Backport21
Category deleted (core)
Assignee changed from Marc-Andre Lafortune to Yui NARUSE
Target version deleted (current: 2.2.0)

You'll have to backport r45206 -> r45208 in addition to r45209.

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Backport #9575: Step with 0 step is buggy
https://bugs.ruby-lang.org/issues/9575#change-45511

* Author: Marc-Andre Lafortune
* Status: Open
* Priority: Normal
* Assignee: Yui NARUSE
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I didn't realize that we now allow stepping with a '0' step. It should probably have been mentioned in the NEWS of 2.1.0?

Anyways, couple of bugs with that new feature:

    bn = 1 << 100
    bn.step(by: 0, to: bn).first(2) # => [bn, bn] ok
    bn.step(by: 0).first(2)         # => [bn.to_f, bn.to_f] not ok
    bn.step(by: 0, to: 0).first(2)  # => [] not ok

The corresponding `size` don't all work either:

    bn.step(by: 0) # => Float::INFINITY, ok
    bn.step(by: 0, to: bn).size # => ZeroDivisionError: divided by 0, should be infinity
    bn.step(by: 0, to: 0).size  # => same
    1.step(by:0, to: 42).size   # => same

My patch is almost finished.



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