We want child mocks to match their "type" (async or sync). 

Ex:

class Prod:
   async def foo():
      pass
    def bar():
       pass

a_mock = AsyncMock(Prod)
isinstance(a_mock.foo(), AsyncMock) == True
isinstance(a_mock.bar(), MagicMock) == True

Also this should include magic methods:

int(a_mock) should work and return 1 like MagicMocks do.
a_mock.__enter__ should exist and be a MagicMock, just as a_mock.__aenter__ exists and is an AsyncMock.