Add types to dump/load interface

 import easyuri
 
 
-def dump(payload, **kwargs):
+def dump(payload, **kwargs) -> dict | list:
     path = kwargs.pop("path", None)
     output = JSONEncoder(**kwargs).encode(payload)
-    if path is None:
-        return output
-    with pathlib.Path(path).open("w") as fp:
-        fp.write(output)
+    if path:
+        with pathlib.Path(path).open("w") as fp:
+            fp.write(output)
+    return output
 
 
-def load(payload=None, path=None):
+def load(payload=None, path=None) -> dict | list:
     if path:
         with pathlib.Path(path).open("r") as fp:
             return json.load(fp)
     elif payload:
         return json.loads(payload)
+    raise RuntimeError("must provide payload or path")
 
 
 class JSONEncoder(json.JSONEncoder):