The property name under which companion payloads are carried inside the plain object produced by
BaseEntity.GetDataObject() and consumed by BaseEntity.LoadFromData().
The trailing triple underscore follows the convention already set by OldValues___ and
RestoreContext___: it marks a reserved, non-field slot and makes accidental collision with a
real column name effectively impossible.
The property name under which companion payloads are carried inside the plain object produced by
BaseEntity.GetDataObject()and consumed byBaseEntity.LoadFromData().The trailing triple underscore follows the convention already set by
OldValues___andRestoreContext___: it marks a reserved, non-field slot and makes accidental collision with a real column name effectively impossible.