filterx: `set_fields()` #1218

Job	Run time
create-source-tarball	1m 51s
create-packages / almalinux-8	3m 53s
create-packages / almalinux-9	7m 23s
create-packages / debian-bookworm	6m 37s
create-packages / debian-testing	6m 20s
create-packages / fedora-41	8m 49s
create-packages / ubuntu-noble	9m 13s
	44m 6s

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