[ruby-core:23168] [Bug #1367] flatten(0) is not consistent with flatten(), flatten(1), etc.

Bug #1367: flatten(0) is not consistent with flatten(), flatten(1), etc.
http://redmine.ruby-lang.org/issues/show/1367

Author: Paul Lewis
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.0 (2008-06-20 revision 17482) [i486-linux]

> a = [1, 2]
> a2 = a.flatten
> a2 << :a
> a2
=> [1, 2, :a]
> a
=> [1, 2]

> b = [3, 4]
> b2 = b.flatten 1
> b2 << :b
> b2
=> [3, 4, :b]
> b
=> [3, 4]

HOWEVER:

> c = [5, 6]
> c2 = c.flatten 0
> c2 << :c
> c2
=> [5, 6, :c]
> c
=> [5, 6, :c]  <-- Huh?  Should be [5, 6].


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