:   '''[info object] isa''' ''category object'' ?''arg''?

This tests whether ''object'' (a [TclOO] [object]) is a member of the given ''category'' (possibly as modified by ''arg''). The supported categories are:

'''info object isa class''' ''object''
    :   Is ''object'' a [class]? (Being a class means being an instance of [oo::class] or one of its subclasses.)
'''info object isa metaclass''' ''object''
    :   Is ''object'' a metaclass? (A metaclass is a subclass of [oo::class].)
'''info object isa mixin''' ''object class''
    :   Is ''class'' directly mixed into ''object''?
'''info object isa object''' ''command''
    :   Is ''command'' really an object?  (If it is, it will be an instance of [oo::object] or any of its subclasses; that's the whole TclOO class system though.)
'''info object isa typeof''' ''object class''
    :   Is ''object'' of the type of the given ''class''? (It is if it is an instance of the class or a one of its direct or indirect subclasses.)

<<categories>>Command