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[JVM] Handle null in is(int|num|str) #795

Closed usev6 closed 1 year ago

usev6 commented 1 year ago

This avoids a NullPointerException in code like the following:

nqp::say(nqp::isstr(nqp::null()))

That code prints a 0 now -- which brings the behaviour of the JVM backend in line with that of MoarVM.