Problem Description

We have

sage: set().isdisjoint(set())
True

sage: Set().isdisjoint(Set())
[...]
AttributeError: 'Set_object_enumerated_with_category' object has no attribute 'isdisjoint'

Proposed Solution

Make Set as much consistent with Python's set, in particular, add .isdisjoint() method.

Alternatives Considered

N/A

Additional Information

No response

Is there an existing issue for this?

• I have searched the existing issues for a bug report that matches the one I want to file, without success.