Fix URI template derivation and lookup #488

Job	Run time
build (ubuntu-latest, Debug)	3m 26s
build (windows-latest, Debug)	4m 4s
build (ubuntu-latest, Release)	3m 21s
build (windows-latest, Release)	4m 18s
build (macos-latest, Release)	1m 39s
build (macos-latest, Debug)	1m 18s
publish-coverage	0s
	18m 6s

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