[ruby-core:74604] [Ruby trunk Bug#12221] Enumerable#sort_by method doesn't work properly when the array has more than 6 elements and you pass nil to the block

Issue #12221 has been updated by Tsuyoshi Sawada.


What is wrong with it?

----------------------------------------
Bug #12221: Enumerable#sort_by method doesn't work properly when the array has more than 6 elements and you pass nil to the block
https://bugs.ruby-lang.org/issues/12221#change-57731

* Author: Lucas Caton
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
~~~
%w(1 2).sort_by { |i| nil }
# => ["1", "2"]

# ...

%w(1 2 3 4 5 6).sort_by { |i| nil }
# => ["1", "2", "3", "4", "5", "6"]
~~~

So far, so good...
But look what happens when you have 7 or more elements:

~~~
%w(1 2 3 4 5 6 7).sort_by { |i| nil }
# => ["4", "2", "3", "1", "5", "6", "7"]

%w(1 2 3 4 5 6 7 8).sort_by { |i| nil }
# => ["8", "2", "3", "4", "5", "6", "7", "1"]

%w(1 2 3 4 5 6 7 8 9).sort_by { |i| nil }
# => ["9", "2", "3", "4", "5", "6", "7", "8", "1"]

%w(1 2 3 4 5 6 7 8 9 10).sort_by { |i| nil }
# => ["10", "2", "3", "4", "5", "6", "7", "8", "9", "1"]
~~~



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