New issue 1018: Document how _is_valid works https://bitbucket.org/yt_analysis/yt/issue/1018/document-how-_is_valid-works
Right now we only mention _is_valid one on this page: http://yt-project.org/docs/dev/developing/creating_frontend.html
It would be nice if we could expand that description, since people who write new frontends often ask about it.
We should incorporate the new semantics added in PR 1417
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