towards v1.10.0 [BREAKING] #358

Job	Run time
test_matrix (ubuntu, 2.5)	25s
test_matrix (ubuntu, 2.6)	30s
test_matrix (ubuntu, 2.7)	26s
test_matrix (ubuntu, 3.0)	10s
test_matrix (ubuntu, 3.1)	25s
test_matrix (ubuntu, 3.2)	10s
test_matrix (ubuntu, head)	19s
test_matrix (ubuntu, truffleruby)	44s
test_matrix (ubuntu, truffleruby-head)	49s
test_matrix (ubuntu, jruby)	52s
test_matrix (ubuntu, jruby-head)	45s
test_matrix (macos, 2.5)	55s
test_matrix (macos, 2.6)	1m 16s
test_matrix (macos, 2.7)	54s
test_matrix (macos, 3.0)	26s
test_matrix (macos, 3.1)	35s
test_matrix (macos, 3.2)	24s
test_matrix (macos, head)	38s
test_matrix (macos, truffleruby)	58s
test_matrix (macos, truffleruby-head)	1m 6s
test_matrix (macos, jruby)	1m 15s
test_matrix (macos, jruby-head)	1m 47s
finish	1s
	15m 50s

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