Remove old commented-out change_type assertions in git.diff

Author: EliahKagan

git/diff.py

@@ -40,11 +40,6 @@
 
 Lit_change_type = Literal["A", "D", "C", "M", "R", "T", "U"]
 
-
-# def is_change_type(inp: str) -> TypeGuard[Lit_change_type]:
-#     # return True
-#     return inp in ['A', 'D', 'C', 'M', 'R', 'T', 'U']
-
 # ------------------------------------------------------------------------
 
 
@@ -693,7 +688,6 @@ def _handle_diff_line(lines_bytes: bytes, repo: "Repo", index: DiffIndex) -> Non
             # Change type can be R100
             # R: status letter
             # 100: score (in case of copy and rename)
-            # assert is_change_type(_change_type[0]), f"Unexpected value for change_type received: {_change_type[0]}"
             change_type: Lit_change_type = cast(Lit_change_type, _change_type[0])
             score_str = "".join(_change_type[1:])
             score = int(score_str) if score_str.isdigit() else None