filterx: set ignore_falsy_return and return fillable in literal gener… #1474

Job	Run time
create-source-tarball	1m 55s
create-packages / almalinux-8	5m 26s
create-packages / debian-bookworm	6m 34s
create-packages / debian-testing	6m 49s
create-packages / fedora-39	6m 14s
create-packages / ubuntu-noble	8m 25s
	35m 23s

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