From: Christoph Rippel <crippel@...>
Date: 2000-12-10T01:36:37+09:00
Subject: [ruby-talk:6972] Re: return value of mutating methods

>> I don't claim ALL bang methods should return nil if no
>> modification happens (yet); for example, reverse! and sort!
>> might be exceptions.

The current behavior of collect! is already incompatible with 
the bang rule - it always returns the object but should always
return nil (which is obviously a pretty useless behavior).

Christoph