refactor: fetch-compatible signature #742

Job	Run time
test (18, base)	47s
test-cli (18)	2m 58s
ensure-manifests	45s
test (18, core)	54s
lint	53s
test-cli (20)	2m 56s
test (18, cube)	1m 27s
test (18, csvw)	51s
test (18, formats)	52s
type-check	1m 24s
global-installation (ubuntu-latest, 20)	2m 7s
test (18, ftp)	57s
global-installation (macos-latest, 20)	1m 46s
test (18, graph-store)	48s
global-installation (windows-latest, 20.12.1)	10m 16s
test (18, http)	53s
smoke-test-cli (ubuntu-latest, 20)	1m 13s
test (18, rdf)	53s
smoke-test-cli (macos-latest, 20)	1m 18s
test (18, s3)	48s
smoke-test-cli (windows-latest, 20.12.1)	2m 3s
test (18, sparql)	52s
test (18, shacl)	47s
test (18, validation)	1m 44s
test (20, base)	46s
test (20, core)	53s
test (20, cube)	1m 23s
test (20, csvw)	47s
test (20, formats)	49s
test (20, ftp)	55s
test (20, graph-store)	44s
test (20, http)	48s
test (20, rdf)	50s
test (20, s3)	46s
test (20, sparql)	45s
test (20, shacl)	47s
test (20, validation)	1m 39s
	52m 4s

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