build

produce true on distinct for less than 2 elements #7017

Job	Run time
compiler-warnings	2m 25s
format-check	3m 52s
docker-tests	20m 2s
build-mdbook	4s
integration-tests (ubuntu-latest, oopsla19)	18m 27s
scaladoc-check	3m 7s
unit-tests (ubuntu-latest)	5m 14s
integration-tests (ubuntu-latest, arrays)	16m 3s
unit-tests (macos-latest)	3m 13s
integration-tests (macos-latest, oopsla19)	19m 4s
	1h 31m 31s

Provide feedback