[PEAK] Bug(?) Rules istype is upgraded to isinstance

[Sergey Schetinin]

It seems that istype(cls) is not converted to a type comparision but
to an `isinstance' check when upgrading the matching engine. Here's
the code from the PEAK-Rules source:

when(type_to_test, (istype,))
def istype_to_test(typ, expr, engine):
    return Test(IsInstance(expr), typ)


-- 
Best Regards,
Sergey Schetinin

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