Generalize lpadZip/rpadZip #200
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This generalizes the left/right padding functions from lists to anything that is
Zip. A particularly useful use-case isNonEmpty.This also makes them lazier with respect to infinite lists:
lpadZip (repeat ()) []no longer hangs as it tries tocatMaybesinfinitely manyNothings.The shape preservation aspect follows from the absorption laws of
Zip.