From: Hans Mackowiak <lists@...>
Date: 2013-03-11T05:34:32+09:00
Subject: Re: Confusion with unary operator overidding

there is no @ operator, its part of the method name TO DIFFERATE between
obj + obj2 and +obj

! does not have a method for obj ! obj2 so it does not need an @ at the 
unary name

same for methods that end with !, they only use that for this method 
names when there is a non-! method too like gsub has a gsub! partner, 
but replace is not called replace! because there is not an second method

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