issue_comments: 368100305

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https://github.com/pydata/xarray/issues/1938#issuecomment-368100305 https://api.github.com/repos/pydata/xarray/issues/1938 368100305 MDEyOklzc3VlQ29tbWVudDM2ODEwMDMwNQ== 3064397 2018-02-23T18:39:50Z 2018-02-23T18:40:46Z NONE

VarArgs itself is actually a type, so you need to create instances which wrap the list argument, for example:

```python In [1]: from blaze.compute.varargs import VarArgs

In [2]: from multipledispatch import dispatch

In [3]: @dispatch(VarArgs[float]) ...: def f(args): ...: print('floats') ...:

In [4]: @dispatch(VarArgs[str]) ...: def f(args): ...: print('strings') ...:

In [5]: @dispatch(VarArgs[str, float]) ...: def f(args): ...: print('mixed') ...:

In [6]: f(VarArgs(['foo'])) strings

In [7]: f(VarArgs([1.0])) floats

In [8]: f(VarArgs([1.0, 'foo'])) mixed

In [9]: VarArgs([1.0, 'foo']) Out[9]: VarArgsfloat, str ```

You could hide this behind a top-level function that wraps the input for the user, or register a dispatch for list which boxes and recurses into itself.

 
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