Tests

fast-path for initialisation of Graph for adjacency that is known to be sorted #2299

Job	Run time
ubuntu-latest, ci/310-oldest.yaml	6m 2s
ubuntu-latest, ci/310.yaml	3m 45s
ubuntu-latest, ci/311.yaml	5m 10s
ubuntu-latest, ci/312.yaml	7m 49s
ubuntu-latest, ci/312-dev.yaml	6m 29s
ubuntu-latest, ci/312-no-optional.yaml	5m 43s
macos-latest, ci/312.yaml	18m 52s
windows-latest, ci/312.yaml	13m 20s
	1h 7m 10s

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