areas_and_lengths Incorrect Default area_unit

[bixb0012]

According to the areas_and_lengths documentation:

If area_unit is not specified, then the units are meters.

Meters is not a valid areal unit. This appears to not just be a documentation issue but an actual code issue:

>>> from arcgis import gis, geometry
>>>
>>> gis = gis.GIS()
>>>
>>> geom_json = {
...     "rings": [[[0, 0], [0, 10], [10, 10],[10, 0],[0, 0]]],
...     "SpatialReference": {"wkid": 3857}
... }
>>>
>>> geom = geometry.Geometry(geom_json)
>>> geometry.areas_and_lengths(geom, "", "", "", 3857)
Error computing areas and lengths
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispython\lib\site-packages\arcgis\geometry\functions.py", line 85, in areas_and_lengths
    spatial_ref)
  File "C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispython\lib\site-packages\arcgis\_impl\tools.py", line 4596, in areas_and_lengths
    return self._con.post(path=url, postdata=params, token=self._token)
  File "C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispython\lib\site-packages\arcgis\_impl\connection.py", line 956, in post
    self._handle_json_error(resp_json['error'], errorcode)
  File "C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispython\lib\site-packages\arcgis\_impl\connection.py", line 976, in _handle_json_error
    raise RuntimeError(errormessage)
RuntimeError: Error computing areas and lengths
(Error Code: 500)
>>> 
>>> # override default "meters" with "square meters"
>>> geometry.areas_and_lengths(geom,"", "esriSquareMeters", "", 3857)
{'areas': [100], 'lengths': [40]}
>>> 

[achapkowski]

@bixb0012 for areas_and_lengths all the values are required, and if not given properly they are expected to fail.