id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
272460887,MDExOlB1bGxSZXF1ZXN0MTUxNTc2MzA1,1705,Make Indexer classes not inherit from tuple.,1217238,closed,0,,,5,2017-11-09T07:08:27Z,2017-11-17T16:33:40Z,2017-11-14T03:32:34Z,MEMBER,,0,pydata/xarray/pulls/1705,"I'm not entirely sure this is a good idea. The advantage is that it ensures that
all our indexing code is entirely explicit: everything that reaches a backend
*must* be an ExplicitIndexer. The downside is that it removes a bit of
internal flexibility: we can't just use tuples in place of basic indexers
anymore. On the whole, I think this is probably worth it but I would appreciate
feedback.

@fujiisoup can you take a look?

 - [x] Tests added / passed
 - [x] Passes ``git diff upstream/master **/*py | flake8 --diff``
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