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Add some docstrings
Tue, 21 May 2019 22:51:10 -0400, by Steve Losh
Add duplicate option checks, update test suite
Tue, 21 May 2019 22:05:24 -0400, by Steve Losh
Add some helpful type checks
Mon, 20 May 2019 19:34:36 -0400, by Steve Losh

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