issue_comments: 451581920

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https://github.com/pydata/xarray/pull/2648#issuecomment-451581920 https://api.github.com/repos/pydata/xarray/issues/2648 451581920 MDEyOklzc3VlQ29tbWVudDQ1MTU4MTkyMA== 1217238 2019-01-04T22:03:51Z 2019-01-04T22:03:51Z MEMBER

ok, so we use the ReprObject for the default, and then test if concat_dim is of type `ReprObject and then test its equivalance?

No, just check identity with the exact ReprObject used as the default value.

This is just a slightly more readable version of the common idiom of use object() as a default value, e.g., as shown here http://effbot.org/zone/default-values.htm#what-to-do-instead

 
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