Hammer CLI

Hammer doesn't allow to to send nil values, which prevents users from re-setting attributes to their default values in some cases. The only thing a user can do is to send empty string --param="" but it's not the same as nil.

From the discussions about this topic it seems that one of the solutions could be to use a reserved value, that would be translated to nil internally. Users could override the value using some env variable.
For example:

hammer domain update --name test --dns nil
HAMMER_NIL=None hammer domain update --name test --dns None