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TODO: remove kludge in Str.perl after null str bug is resolved #1837
b12fba3 adds a kludge to bail out if a string is null, however, the code shown in the commit message likely shouldn't have null strings in the first place as they cause issues in many other places:
There's a possibly-incorrect PR in MoarVM to fix this bug: MoarVM/MoarVM#767
When the bug is fixed, the kludge should be removed.