Could we get (perhaps computed) center coordinates for all elements?

[mcepl]

For example:

from OSMPythonTools.api import Api
api = Api()
way = api.query('relation/3629242')
way.centerLat()
way.centerLon()

I understand that it is probably not trivial and some computation would have to be done in the background, but either remove those methods when they cannot be filled with some meaningful data or compute the result?