From: Benoit Daloze <eregontp@...>
Date: 2010-12-15T20:35:53+09:00
Subject: [ruby-core:33723] Re: [Ruby 1.9-Bug#4136] Enumerable#reject should not inherit the receiver's instance variables

On 15 December 2010 05:32, Marc-Andre Lafortune
<ruby-core-mailing-list@marc-andre.ca> wrote:
> Or similarly, why does:
>
> � �(x.slice(0,0)).class # => Sub
> � �# while...
> � �(x.slice!(0,0)).class # => Array
>
> Thanks
> --
> Marc-Andr�

I suppose you already know this, but it might help others:

x.slice!(0, 1).class # => Sub
x.slice!(0..0).class # => Sub

x.slice!(0, 0).class # => Array
x.slice!(1, 0).class # => Array
x.slice!(1..0).class # => Array

So, it seems any arguments to #slice which return some kind of Array
except slice(n, 0) and slice(n, <n) return a Sub.

This is inconsistent IMHO, because it should return the same class,
even when the array is empty (for the cases it returns some kind of
Array).
Also, a mutating method should (most of the time) not change an object's class.

Regards,
B.D.