Merge pull request #182 from ruby/remove-null-writer #494

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.6 / ubuntu-latest)	35s
test (2.6 / macos-latest)	50s
test (2.6 / windows-latest)	2m 47s
test (2.7 / ubuntu-latest)	35s
test (2.7 / macos-latest)	38s
test (2.7 / windows-latest)	1m 59s
test (3.0 / ubuntu-latest)	22s
test (3.0 / macos-latest)	25s
test (3.0 / windows-latest)	1m 13s
test (3.1 / ubuntu-latest)	21s
test (3.1 / macos-latest)	25s
test (3.1 / windows-latest)	1m 50s
test (3.2 / ubuntu-latest)	24s
test (3.2 / macos-latest)	25s
test (3.2 / windows-latest)	2m 13s
test (3.3 / ubuntu-latest)	24s
test (3.3 / macos-latest)	27s
test (3.3 / windows-latest)	1m 37s
test (head / ubuntu-latest)	22s
test (head / macos-latest)	25s
test (head / windows-latest)	1m 28s
	19m 48s

Provide feedback