non-null or not non-null, that is the kvetch, son

Nice language, Tamkin.

> In most cases we care only about whether a variable is non-null or
> not non-null,

Let me translate that into English: in most of these cases we care 
whether a variable has content or not.  If it doesn't, it makes no 
difference to *us* whether it's null or unset.

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