Conceptually, these are the same as IDProps used for regular dynamic RNA
data (should have been done that way from the beginning). At least make
them statically typed, to avoid all kind of issues when the IDProp type
change and does not match expectations from the geometry nodes anymore.
Ref. #122743.
Pull Request: https://projects.blender.org/blender/blender/pulls/122891
9c41bf4fa2