https://typeit.readthedocs.io/en/develop/cookbook/docker_compose.html#extending `PortMappingSchema[PortMapping]` can be reduced to just `PortMappingSchema` as `PortMapping` link can be inferred from type hints.
https://typeit.readthedocs.io/en/develop/cookbook/docker_compose.html#extending
PortMappingSchema[PortMapping]can be reduced to justPortMappingSchemaasPortMappinglink can be inferred from type hints.