From: Joel Pearson <lists@...>
Date: 2013-04-02T22:40:54+09:00
Subject: Re: Recursion with Hash

If it's something you do commonly then you could always write a method 
which does it for you.

However, for the sake of readability in case you (or someone else) has 
to work out what the code is doing years later, it's probably worth 
writing it out in an expressive form; tap looks fine.

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