Why not support an API that can break up circular reference of a Machine object ?

[dokiyi]

An example start from here :

from transitions import Machine
customMachine = Machine()

There are serial circular reference in the new object customMachine, for example customMachine.models is referenced by customMachine while customMachine is also referenced by customMachine.models‘scustomMachine.models[0]. Some functions.partial object in customMachine is similar too.

The object customMachine will not be recycle as soon as all its references, which is held by application, are released. Side effect can be control with cpython's gc work properly, but extreme case might exist though...

Why not support an API that can break up those circular reference of a Machine object? Or if I'm rude, from the view of developer, Is there appropriate way to help application to break up circular reference in some case correctly?