Merge pull request #597 from larskanis/fix-inspect-on-ruby-head #687

Job	Run time
Build	9s
Test (windows, head, 16.0-1-windows-x64, 16)	2m 33s
Test (windows, 2.5, 9.4.26-1-windows-x64, 9.4)	6m 28s
Test (windows, mswin, 16.0-1-windows-x64, 16)	2m 13s
Test (ubuntu, head, 16)	1m 3s
Test (ubuntu, 3.2, 12)	1m 8s
Test (ubuntu, 20.04, 2.5, 9.3)	1m 26s
Test (ubuntu, truffleruby, 13)	1m 22s
Test (ubuntu, truffleruby-head, 16)	1m 57s
Test (macos, head, 16.0-1-osx, 16)	1m 17s
	19m 36s

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