build

Fixing context disposal vs. statistics thread #7052

Job	Run time
build-mdbook	7s
format-check	3m 57s
docker-tests	21m 2s
compiler-warnings	2m 11s
scaladoc-check	3m 1s
integration-tests (ubuntu-latest, oopsla19)	18m 17s
unit-tests (ubuntu-latest)	5m 59s
integration-tests (ubuntu-latest, arrays)	17m 21s
unit-tests (macos-latest)	3m 1s
integration-tests (macos-latest, oopsla19)	19m 9s
	1h 34m 5s

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