issue_comments: 464189040

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https://github.com/pydata/xarray/issues/2770#issuecomment-464189040 https://api.github.com/repos/pydata/xarray/issues/2770 464189040 MDEyOklzc3VlQ29tbWVudDQ2NDE4OTA0MA== 1217238 2019-02-15T20:31:15Z 2019-02-15T20:31:15Z MEMBER

Apparently isnull(datetime64_scalar_array) returns a Python boolean False. This gets inverted by ~ to -1 instead of True in our implementation of count: https://github.com/pydata/xarray/blob/4cd56a9edb083a3eb8d11e7a367dfb9bda76fc2e/xarray/core/duck_array_ops.py#L188

To fix this, we should either switch ~x to np.logical_not(x).

 
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