issue_comments: 368105739

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https://github.com/pydata/xarray/issues/1938#issuecomment-368105739 https://api.github.com/repos/pydata/xarray/issues/1938 368105739 MDEyOklzc3VlQ29tbWVudDM2ODEwNTczOQ== 3064397 2018-02-23T18:57:59Z 2018-02-23T18:58:47Z NONE

We could make a particular list an instance of a particular TypedVarArgs; however, multiple dispatch uses the type() of arguments as well as issubclass to do dispatching. Multiple dispatch depends on being able to partially order types to make dispatching more efficient. The constructor of VarArgs scans for the types of the elements and constructs an instance of a new (but memoized) subclass of VarArgs which encodes the element types so that issubclass works as expected. The problem is that type([1.0, 'foo']) returns just list which erases all information about the elements.

 
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