issue_comments: 135139591

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https://github.com/pydata/xarray/pull/551#issuecomment-135139591 https://api.github.com/repos/pydata/xarray/issues/551 135139591 MDEyOklzc3VlQ29tbWVudDEzNTEzOTU5MQ== 1217238 2015-08-26T18:58:49Z 2015-08-26T18:58:49Z MEMBER

I think you can put the Dataset checks in _update_vars_and_coords (on the keys of new_variables). That method gets called at the lowest level by everything that adds variables.

Note, for example, that you can also create new variables by passing a dictionary into Dataset.merge or Dataset.update.

 
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