Rails core - Feb 2006 - Don''t use "and" and "or" for boolean tests, instead always use "&&" and "||"

This is now Tha Law on all new patches. I documented this on the style
guide at dev.rubyonrails.org.

Reasoning: Everyone always forget the different binding rules of "and"
and "or", which has resulted in bugs before. And it looks inconsistent
with the rest of the code base.
--
David Heinemeier Hansson
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