BUG: Fix cast safety and comparisons for zero sized voids #19351
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Backport of #19322.
These are more complicated and weird things could happen...
right now, the only "weird" thing is that some sized to unsized
voids casts may be considered as safe when they should not be.
I think this is fine... In general, we need to fix all casts
to a strict interpretation of V0, S0, and U0 and then then
allow "V", "S", and "U" explicitly on the python entry-points
Right now, this is as minimal as I could make it work, it isn't
as minimal as I would like after a release, but here we go...