Add `validate_as:` switch to validation methods. #32

Job	Run time
test-isolated	12s
test-isolated	12s
test (ubuntu, 2.7)	25s
test (ubuntu, 2.7)	24s
test-yjit (ubuntu, 3.1)	12s
test-yjit (ubuntu, 3.1)	12s
test (ubuntu, 3.0)	14s
test (ubuntu, 3.0)	14s
test-yjit (ubuntu, 3.2)	11s
test-yjit (ubuntu, 3.2)	11s
test (ubuntu, 3.1)	12s
test (ubuntu, 3.1)	12s
test-yjit (ubuntu, 3.3)	9s
test-yjit (ubuntu, 3.3)	9s
test (ubuntu, 3.2)	12s
test (ubuntu, 3.2)	12s
test-yjit (ubuntu, head)	9s
test-yjit (ubuntu, head)	9s
test (ubuntu, 3.3)	15s
test (ubuntu, 3.3)	15s
test-yjit (macos, 3.1)	33s
test-yjit (macos, 3.1)	33s
test (ubuntu, head)	9s
test (ubuntu, head)	9s
test-yjit (macos, 3.2)	37s
test-yjit (macos, 3.2)	37s
test-yjit (macos, 3.3)	32s
test-yjit (macos, 3.3)	32s
test (ubuntu, jruby)	57s
test (ubuntu, jruby)	57s
test-yjit (macos, head)	31s
test-yjit (macos, head)	31s
test (ubuntu, jruby-head)	58s
test (ubuntu, jruby-head)	58s
test (ubuntu, truffleruby)	39s
test (ubuntu, truffleruby)	39s
test (ubuntu, truffleruby-head)	41s
test (ubuntu, truffleruby-head)	41s
test (macos, 3.0)	25s
test (macos, 3.0)	25s
test (windows, 3.0)	1m 37s
test (windows, 3.0)	1m 37s
finish	0s
finish	0s
	19m 39s

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