Initialize a BaseRField with storage and default value configuration.

Convert a stored value into the field's runtime representation.

Called when loading a field value from storage. Override this method in subclasses to implement custom deserialization logic.

Get the default value for this field.

If the default value is a Type or Callable, it will be called to generate a new default value. Otherwise, the default value is returned directly.

This ensures that mutable defaults (like lists or dicts) are not shared between Resource instances.

Convert the field's runtime value into a storable representation.

Called when saving a field value to storage. Override this method in subclasses to implement custom serialization logic.