html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/pull/549#issuecomment-134362572,https://api.github.com/repos/pydata/xarray/issues/549,134362572,MDEyOklzc3VlQ29tbWVudDEzNDM2MjU3Mg==,5356122,2015-08-24T20:10:12Z,2015-08-24T20:10:12Z,MEMBER,"You mentioned in the bug report:

> Another way is just to raise an error if a not string variable name is used.

Raising a `TypeError` seems like the way to go here, since `str` works on anything. Relevant line in 'Zen':

> In the face of ambiguity, refuse the temptation to guess.

Also, are there other places to implement this? Say the keys of a `dataset`?
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