coordinates lost after destagger

[cosunae]

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Description

I have a data array, var, with the following coordinates:

  * time        (time) int64 8B 0
  * z           (z) int64 480B 1 2 3 4 5 6 7 8 9 ... 52 53 54 55 56 57 58 59 60
    lat         (y, x) float64 2MB 42.18 42.18 42.18 42.19 ... 50.13 50.13 50.13
    lon         (y, x) float64 2MB 0.8064 0.8331 0.8598 ... 17.43 17.46 17.49
    valid_time  (time) datetime64[ns] 8B 2016-03-14T20:00:00
    ref_time    datetime64[ns] 8B 2016-03-14T20:00:00

After applying destagger(var, "x"), many coordinates are lost.

Coordinates:
  * time     (time) int64 8B 0
  * z        (z) int64 480B 1 2 3 4 5 6 7 8 9 10 ... 52 53 54 55 56 57 58 59 60

Shouldnt we retain whatever coordinates the input array brings ?

[cosunae]

except for lon,lat which should be computed accordingly to the destagger operation

[cosunae]

I think we could formalize the metadata model and have a function that imposes it.
We then can run the function that checks all the required coordinates are present and run it on every test.