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A difference between Typer and TreeUnpickler is that Typer performs a simplification step after type assigning a tree mode and unpickler doesn't. This makes a difference for lubs in unsafeNulls mode. We fix this by also doing simplification in Unpickler for trees that can have types resulting from lubs.
I was not able to find out why that's the case, but the original test case with the import in the function body requires that if's are _not_ simplified by Unpickler. The interaction with lubs and unsafenulls seems to be very tricky. Anyway, we now have two versions of all test cases, with local as well as globak unsafe nulls.
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A difference between Typer and TreeUnpickler is that Typer performs
a simplification step after type assigning a tree mode and unpickler
doesn't. This makes a difference for lubs in unsafeNulls mode.
We fix this by also doing simplification in Unpickler for trees
that can have types resulting from lubs.