Summary

Both pandas and xarray now have ato_numpy method on their data objects. We only useto_numpy once incbook._reshape_2D, and instead usually check.values. We probably should be usingto_numpy more if that is indeed the new idiom for converting?

Ping@shoyer for xarray and@TomAugspurger for pandas, though please feel free to redirect as appropriate, you are being picked upon because you've interacted with us before 😉.

One thing I note forto_numpy and dates is that it does not seem to convert to numpydatetime64 ortimedelta64 for either package - it'd be nice if they did!