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RE: Why is booleanp defined this way?

From: Drew Adams
Subject: RE: Why is booleanp defined this way?
Date: Fri, 17 Apr 2015 19:37:28 -0700 (PDT) 
If you grep for `booleanp' in the Emacs Lisp sources you will
see that it is used pretty much exclusively as the value of
property `safe-local-variable'.

IOW, it is used (only) to declare that the value of this or
that variable can be considered "safe" if it is `t' or `nil'.
That's all.
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