test

preventing hang when TCPSocket readable, but no app-data is available #594

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.6 / macos-latest)	45s
test (2.7 / ubuntu-latest)	37s
test (2.6 / ubuntu-latest)	40s
test (2.6 / windows-latest)	1m 57s
test (2.7 / macos-latest)	43s
test (2.7 / windows-latest)	1m 49s
test (3.1 / ubuntu-latest)	24s
test (3.0 / macos-latest)	28s
test (3.0 / ubuntu-latest)	22s
test (3.0 / windows-latest)	1m 18s
test (3.1 / macos-latest)	28s
test (3.2 / windows-latest)	1m 23s
test (3.3 / macos-latest)	27s
test (3.2 / macos-latest)	26s
test (3.1 / windows-latest)	1m 15s
test (3.4 / ubuntu-latest)	25s
test (3.3 / windows-latest)	1m 19s
test (3.2 / ubuntu-latest)	25s
test (3.3 / ubuntu-latest)	28s
test (head / windows-latest)	1m 12s
test (3.4 / macos-latest)	27s
test (3.4 / windows-latest)	1m 11s
test (head / macos-latest)	32s
test (head / ubuntu-latest)	25s
	19m 30s

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