docs(testing): add a versionadded note, improve impl

falcon/testing/helpers.py

@@ -974,10 +974,16 @@ def create_scope(
             iterable yielding a series of two-member (*name*, *value*)
             iterables. Each pair of items provides the name and value
             for the 'Set-Cookie' header.
+
+    .. versionadded:: 4.1
+        The raw (i.e., not URL-decoded) version of the provided `path` is now
+        preserved in the returned scope as the ``raw_path`` byte string.
+        According to the ASGI specification, ``raw_path`` **does not include**
+        any query string.
     """
 
     http_version = _fixup_http_version(http_version)
-    raw_path = path.split('?')[0]
+    raw_path, _, _ = path.partition('?')
     path = uri.decode(path, unquote_plus=False)
 
     # NOTE(kgriffs): Handles both None and ''