The Init space can be difficult to set up for crate outsider types

[Aursen]

Actually, the derive InitSpace macro don't have a easiest way to set a raw space for any field. If this field does not implement the space trait it can be painful.

My solution est to add an attribute #[space(len)] to have the possibility to add raw space or override the current calculation of the space

You can assign the task to me I will handle it