a different alternate of dict.get

Pushing this up just to compare the mypy-primer damage as compared
with python#13222. I expect it to be more disruptive, but I'm curious how
much more. It seems similar to but dramatically less disruptive than
an older attempt at changing dict.get in python#10294.

stdlib/@tests/stubtest_allowlists/common.txt

@@ -10,7 +10,7 @@ _collections_abc.AsyncGenerator.ag_frame
 _collections_abc.AsyncGenerator.ag_running
 asyncio.BaseEventLoop.subprocess_exec  # BaseEventLoop adds several parameters and stubtest fails on the difference if we add them
 asyncio.base_events.BaseEventLoop.subprocess_exec  # BaseEventLoop adds several parameters and stubtest fails on the difference if we add them
-builtins.dict.get
+# builtins.dict.get
 collections\.ChainMap\.fromkeys  # https://github.com/python/mypy/issues/17023
 configparser.SectionProxy.__getattr__  # SectionProxy can have arbitrary attributes when custom converters are used
 configparser.SectionProxy.getboolean  # SectionProxy get functions are set in __init__

stdlib/builtins.pyi

@@ -1124,9 +1124,7 @@ class dict(MutableMapping[_KT, _VT]):
     def fromkeys(cls, iterable: Iterable[_T], value: _S, /) -> dict[_T, _S]: ...
     # Positional-only in dict, but not in MutableMapping
     @overload  # type: ignore[override]
-    def get(self, key: _KT, /) -> _VT | None: ...
-    @overload
-    def get(self, key: _KT, default: _VT, /) -> _VT: ...
+    def get(self, key: _KT, default: None = None, /) -> _VT | None: ...
     @overload
     def get(self, key: _KT, default: _T, /) -> _VT | _T: ...
     @overload