[ruby-core:91337] [Ruby trunk Feature#15573] Permit zero step in Numeric#step and Range#step

Issue #15573 has been updated by shevegen (Robert A. Heiler).


I can't say in which way to change it but I think this is indeed surprising
behaviour and should be changed either way towards more consistency when
possible.

----------------------------------------
Feature #15573: Permit zero step in Numeric#step and Range#step
https://bugs.ruby-lang.org/issues/15573#change-76586

* Author: mrkn (Kenta Murata)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
----------------------------------------
Numeric#step disallows zero in the 2nd argument, but it allows zero passed as the value of `by:` keyword argument.  I confirmed that this inconsistency exists since 2.3. I want to allow zero in the 2nd argument, too.

```
>> 1.step(10, by: 0) { break }
=> nil
>> 1.step(10, 0) { break }
Traceback (most recent call last):
        5: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `<main>'
        4: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `load'
        3: from /Users/mrkn/.rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        2: from (irb):5
        1: from (irb):5:in `step'
ArgumentError (step can't be 0)
```

Moreover, Range#step disallows zero if a block is given.  I want to relax also this restriction.

```
>> (1..10).step(0) { break }
Traceback (most recent call last):
        6: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `<main>'
        5: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `load'
        4: from /Users/mrkn/.rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        3: from (irb):6
        2: from (irb):6:in `rescue in irb_binding'
        1: from (irb):6:in `step'
ArgumentError (step can't be 0)
```



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