public SqlContentEntityStorageSchema::requiresFieldDataMigration(FieldStorageDefinitionInterface $storage_definition, FieldStorageDefinitionInterface $original)
Checks if existing data would be lost if the schema changes were applied.
If there are no schema changes needed, then no data needs to be migrated, but it is not the responsibility of this function to recheck what requiresFieldStorageSchemaChanges() checks. Rather, the meaning of what this function returns when requiresFieldStorageSchem