Since dask 1.1.2, this crashes:

import xarray as xr                                                                             
import dask.array as da                                                                         
da.mean(xr.DataArray([1, 2, 3.0])).compute()

The error raised:
TypeError: nansum() got an unexpected keyword argument 'keepdims'

I looks like a regression to me, but maybe I'm missing something ?

Works fine in 1.1.1

Relevant packages:
dask 1.1.2
xarray 0.11.3
numpy 1.16.2