Description

The Format.type and Storage.{type,format} references lead to a lot of pointed fingers, which makes (de)serialization of these types much trickier. We don't really need these references during normal operations, only during "initialization" (used loosely to mean the time between initial object creation through sealing the Graph).

This replaces those fields and validators with _visit_{name} methods that perform any checking and, if needed, return a modified copy with updated attributes (eg: resolving Storage path templates).

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)