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This predicate returns t
if object is a font specifier, and
nil
otherwise.
Return a new font
specifier object with the given specification
list. spec-list can be a list of specifications (each of which is
a cons of a locale and a list of instantiators), a single instantiator,
or a list of instantiators. See Specifiers, for more information
about specifiers.
Valid instantiators for font specifiers are: