Hi,

In message "Re: Array#-, &, |, uniq don't use =="
    on Thu, 27 Sep 2007 08:22:48 +0900, murphy <murphy / rubychan.de> writes:

|Is this a feature? Why do some methods use "=="-equality and others
|"eql?"-equality?

It's a feature, to reduce complexity order from O(m^n) to O(mn).

							matz.