[ruby-talk:02091] Array Gotchas

While I was wondering why '+' was the concatenation and '-' was the 
subtraction, I learned that Array indeed has the concat(other) method, but 
not the substract(other) method and many other explicite spelling ones.

There is already '+' for concatenation, why concat(other). When 
concat(other) why not substract(other) also. And what about union(other), 
etc.

This is a sort of incompleteness and redundancy.

By chance, I also discovered a bug in the manual where it claims the 
following are the same:

each_index {...}
(0..ary.size).each {...}

But they aren't. Do you see why?

Dat

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