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Hash uses eql? not ==
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| 2.1.1 :001 > {2 => "foo", 2.0 => "bar"} | |
| => {2=>"foo", 2.0=>"bar"} | |
| 2.1.1 :002 > 2 == 2.0 | |
| => true | |
| 2.1.1 :003 > 2.eql?(2.0) | |
| => false |
The documentation for Hash keys:
http://www.ruby-doc.org/core-2.1.1/Hash.html#class-Hash-label-Hash+Keys
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In the C code they use a macro EQUAL. I didn't look too closely but it could be calling the eql? method. On the equ? vs == method check out this: http://blog.elpassion.com/ruby-gotchas/