Re-enable PYI034 and use typing.Self

Author: hugovk

pyproject.toml

@@ -168,7 +168,6 @@ lint.ignore = [
   "PT011",  # pytest-raises-too-broad
   "PT012",  # pytest-raises-with-multiple-statements
   "PT017",  # pytest-assert-in-except
-  "PYI034", # flake8-pyi: typing.Self added in Python 3.11
 ]
 lint.per-file-ignores."Tests/oss-fuzz/fuzz_font.py" = [
   "I002",

src/PIL/TiffTags.py

@@ -20,6 +20,10 @@
 
 from typing import NamedTuple
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Self
+
 
 class _TagInfo(NamedTuple):
     value: int | None
@@ -39,7 +43,7 @@ def __new__(
         type: int | None = None,
         length: int | None = None,
         enum: dict[str, int] | None = None,
-    ) -> TagInfo:
+    ) -> Self:
         return super().__new__(cls, value, name, type, length, enum or {})
 
     def cvt_enum(self, value: str) -> int | str: