Can use of exec() and locals() be avoided in processed_property's cast_type() function?

[brocksam]

Code safety may be improved if used of exec() and locals() is avoided. See:

pyproprop/pyproprop/processed_property.py

Lines 136 to 165 in 8aeb8cc

	def cast_type(value):
	"""Enforce type casting of property value to be set to specific type.
	Parameters
	----------
	value : obj
	Property object value for setting.
	Returns
	-------
	obj
	Supplied value cast to the specified type
	Raises
	------
	ValueError
	If the casting fails.
	TypeError
	If the casting fails.
	"""
	cast_str = f"processed_value = {expected_type.__name__}({value})"
	try:
	exec(cast_str)
	except (ValueError, TypeError) as e:
	name_str = generate_name_description_error_message()
	msg = (f"{name_str} must be a {repr(expected_type)}, instead got "
	f"a {repr(type(value))} which cannot be cast.")
	raise e(msg)
	return locals()['processed_value']