Add __all__ to modules beginning with 'j', 'k' and 'l' (#7328)

stdlib/json/__init__.pyi

@@ -4,6 +4,8 @@ from typing import IO, Any, Callable
 from .decoder import JSONDecodeError as JSONDecodeError, JSONDecoder as JSONDecoder
 from .encoder import JSONEncoder as JSONEncoder
 
+__all__ = ["dump", "dumps", "load", "loads", "JSONDecoder", "JSONDecodeError", "JSONEncoder"]
+
 def dumps(
     obj: Any,
     *,

stdlib/json/decoder.pyi

@@ -1,5 +1,7 @@
 from typing import Any, Callable
 
+__all__ = ["JSONDecoder", "JSONDecodeError"]
+
 class JSONDecodeError(ValueError):
     msg: str
     doc: str