bug: The dynamic dispatcher is not filling default values for parameters on callbacks.

[fgmacedo]

• Python State Machine version: 1.0.3
• Python version: 3.11
• Operating System: Any

Description

The dynamic dispatcher is not filling default values for parameters on callbacks.

from statemachine import State
from statemachine import StateMachine


class XMachine(StateMachine):
    initial = State(initial=True, enter="enter_with_default_value")

    test = initial.to.itself()

    def enter_with_default_value(self, value: int = 42):
        assert value == 42, value

XMachine()

Raises:

    assert value == 42, value
           ^^^^^^^^^^^
AssertionError: None

Development notes: Migrate dispatcher.py to inspect.signature that has a nicer API instead of the currently inspect.getfullargspec.