Is your feature request related to a problem?

cc @benbovy

xref #7730

import numpy as np
import xarray as xr

arr = np.random.randn(10, 10, 365*30)
time = xr.date_range("2000", periods=30*365, calendar="noleap")
da = xr.DataArray(arr, dims=("y", "x", "time"), coords={"time": time})
year = da["time.year"]

xr.align(da, year, join="outer", copy=False)

This should result in no copies, but does

Describe the solution you'd like

I think we need to check aligner.copy and/or aligner.reindex (maybe?) before copying here

Describe alternatives you've considered

No response

Additional context

No response