This method allows to set a custom setter function on a per-attribute
basis. This setter function will then be called by
`write_attribute_value()` instead of writing the attribute value
directly. This allows for custom logic to be implemented by the user
(such as checking if the value to be written is within a certain range)
and if not, an appropriate error can be raised from that setter,
preventing the write and notifying the client about the occurred error.

* bump cryptography to >40.0.1 in install_requires

* fix syntax

'__name__' -> __name__

'__name__' -> __name__

Fixes a subscription error if there is a space at the end of the identifier value

* Allow List,Union,Optional named fields

Fixes #1441

* use typing