From: Daniel Ribeiro <danrbr@...>
Date: 2010-11-04T05:34:49+09:00
Subject: Re: the dark side of inherited methods

Scala solved this problem (which can viewed as a lack of the "uniform
return type principle") on its collection library on version 2.8:
http://www.scala-lang.org/docu/files/collections-api/collections_2.html

It used implicits arguments to do this. It is not a simple design, but
it is quite general.

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