ref: add comment why save registration in variable #287

Job	Run time
build / build (windows-latest, cement)	7m 24s
build / build (windows-latest, nuget)	5m 6s
build / build (ubuntu-latest, cement)	3m 11s
build / build (ubuntu-latest, nuget)	1m 54s
build / build (macos-12, cement)	4m 26s
build / build (macos-12, nuget)	2m 8s
test / test (windows-latest, cement, net6.0)	4m 12s
test / test (windows-latest, cement, netcoreapp2.1)	3m 38s
test / test (windows-latest, cement, net471)	3m 43s
test / test (windows-latest, nuget, net6.0)	4m 0s
test / test (windows-latest, nuget, netcoreapp2.1)	3m 42s
test / test (windows-latest, nuget, net471)	3m 53s
test / test (ubuntu-latest, cement, net6.0)	2m 8s
test / test (ubuntu-latest, cement, netcoreapp2.1)	2m 12s
test / test (ubuntu-latest, nuget, net6.0)	2m 8s
test / test (ubuntu-latest, nuget, netcoreapp2.1)	2m 10s
publish / publish	0s
	55m 55s

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