Improve xmlrpc.client callbacks (#8188)

Author: AlexWaygood

stdlib/xmlrpc/client.pyi

@@ -97,32 +97,31 @@ class ExpatParser:  # undocumented
     def feed(self, data: str | bytes) -> None: ...
     def close(self) -> None: ...
 
-class Marshaller:
-
-    dispatch: dict[
-        type[Any], Callable[[Marshaller, Any, Callable[[str], Any]], None]
-    ]  # TODO: Replace 'Any' with some kind of binding
+_WriteCallback: TypeAlias = Callable[[str], object]
 
+class Marshaller:
+    # TODO: Replace 'Any' with some kind of binding
+    dispatch: dict[type[Any], Callable[[Marshaller, Any, _WriteCallback], None]]
     memo: dict[Any, None]
     data: None
     encoding: str | None
     allow_none: bool
     def __init__(self, encoding: str | None = ..., allow_none: bool = ...) -> None: ...
     def dumps(self, values: Fault | Iterable[_Marshallable]) -> str: ...
-    def __dump(self, value: _Marshallable, write: Callable[[str], Any]) -> None: ...  # undocumented
-    def dump_nil(self, value: None, write: Callable[[str], Any]) -> None: ...
-    def dump_bool(self, value: bool, write: Callable[[str], Any]) -> None: ...
-    def dump_long(self, value: int, write: Callable[[str], Any]) -> None: ...
-    def dump_int(self, value: int, write: Callable[[str], Any]) -> None: ...
-    def dump_double(self, value: float, write: Callable[[str], Any]) -> None: ...
-    def dump_unicode(self, value: str, write: Callable[[str], Any], escape: Callable[[str], str] = ...) -> None: ...
-    def dump_bytes(self, value: bytes, write: Callable[[str], Any]) -> None: ...
-    def dump_array(self, value: Iterable[_Marshallable], write: Callable[[str], Any]) -> None: ...
+    def __dump(self, value: _Marshallable, write: _WriteCallback) -> None: ...  # undocumented
+    def dump_nil(self, value: None, write: _WriteCallback) -> None: ...
+    def dump_bool(self, value: bool, write: _WriteCallback) -> None: ...
+    def dump_long(self, value: int, write: _WriteCallback) -> None: ...
+    def dump_int(self, value: int, write: _WriteCallback) -> None: ...
+    def dump_double(self, value: float, write: _WriteCallback) -> None: ...
+    def dump_unicode(self, value: str, write: _WriteCallback, escape: Callable[[str], str] = ...) -> None: ...
+    def dump_bytes(self, value: bytes, write: _WriteCallback) -> None: ...
+    def dump_array(self, value: Iterable[_Marshallable], write: _WriteCallback) -> None: ...
     def dump_struct(
-        self, value: Mapping[str, _Marshallable], write: Callable[[str], Any], escape: Callable[[str], str] = ...
+        self, value: Mapping[str, _Marshallable], write: _WriteCallback, escape: Callable[[str], str] = ...
     ) -> None: ...
-    def dump_datetime(self, value: _XMLDate, write: Callable[[str], Any]) -> None: ...
-    def dump_instance(self, value: object, write: Callable[[str], Any]) -> None: ...
+    def dump_datetime(self, value: _XMLDate, write: _WriteCallback) -> None: ...
+    def dump_instance(self, value: object, write: _WriteCallback) -> None: ...
 
 class Unmarshaller: