filterx: `set_fields()` #1233

Job	Run time
create-source-tarball	1m 54s
create-packages / almalinux-8	4m 3s
create-packages / almalinux-9	7m 23s
create-packages / debian-bookworm	6m 37s
create-packages / debian-testing	6m 32s
create-packages / fedora-41	8m 0s
create-packages / ubuntu-noble	9m 6s
	43m 35s

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