Fix mypy failures

Author: jgraham

tools/manifest/item.py

@@ -279,7 +279,7 @@ class PrintRefTest(RefTest):
 
     @property
     def page_ranges(self) -> PageRanges:
-        return self._extras.get("page_ranges", {})
+        return cast(PageRanges, self._extras.get("page_ranges", {}))
 
     def to_json(self):  # type: ignore
         rv = super().to_json()

tools/manifest/sourcefile.py

@@ -4,8 +4,8 @@
 from collections import deque
 from fnmatch import fnmatch
 from io import BytesIO
-from typing import (Any, BinaryIO, Callable, Deque, Dict, Iterable, List, Optional, Pattern,
-                    Set, Text, Tuple, Union, cast)
+from typing import (Any, BinaryIO, Callable, Deque, Dict, Iterable, List,
+                    Optional, Pattern, Set, Text, Tuple, TypedDict, Union, cast)
 from urllib.parse import urljoin
 
 try:
@@ -68,7 +68,13 @@ def read_script_metadata(f: BinaryIO, regexp: Pattern[bytes]) -> Iterable[Tuple[
         yield (m.groups()[0].decode("utf8"), m.groups()[1].decode("utf8"))
 
 
-_any_variants: Dict[Text, Dict[Text, Any]] = {
+class VariantData(TypedDict, total=False):
+    suffix: str
+    force_https: bool
+    longhand: Set[str]
+
+
+_any_variants: Dict[Text, VariantData] = {
     "window": {"suffix": ".any.html"},
     "window-module": {},
     "serviceworker": {"force_https": True},

tools/webtransport/h3/capsule.py

@@ -108,7 +108,7 @@ def __iter__(self) -> Iterator[H3Capsule]:
             if self._final:
                 raise e
             if not self._buffer:
-                return 0
+                return
             size = self._buffer.capacity - self._buffer.tell()
             if size >= UINT_VAR_MAX_SIZE:
                 raise e