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TYPEP of one argument

Should TYPEP of one argument return a keyword (such as :SYMBOL)
or something in GLOBAL or USER (such as SYMBOL)?
The former is what it does now, and is more compatible with the
past few systems.  But it fails nowadays to be compatible with
Maclisp, which is what TYPEP of one argument is really supported for.
The latter would be compatible with Maclisp as it was originally
intended to be, but might break a few programs right now.