From: Adam Prescott <adam@...>
Date: 2011-12-06T01:39:54+09:00
Subject: Re: black magical hash element vivification

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D'oh! Strike that, it's behaving as expected, it's just hidden beneath an
extra layer of oddness.

>> foo = Hash.new(Hash.new)
=> {}
>> foo[3][2] = true
=> true

There's no assignment for the top-level hash. So the default hash object
specified in Hash.new(Hash.new) has been modified, but you can't see it
directly because you don't do, e.g., foo[3]=. You just need to poke a hole
through, either before or after the fact. Here's after:

>> foo[3] = foo["anything"]
=> {2=>true}
>> foo
=> {3=>{2=>true}}

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