multidispatch base implementation always matches.

Consistent with `singledispatch`. Refs #109.

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## Unreleased
 ### Changed
 * `multidispatch` supports variable keyword arguments
+* `multidispatch` base implementation always matches
 
 ## [1.11.2](https://pypi.org/project/multimethod/1.11.2/) - 2024-02-27
 ### Fixed

multimethod/__init__.py

@@ -406,12 +406,7 @@ def __init__(self, func: Callable[..., RETURN]) -> None:
         self.pending = set()
         self.generics = []
         self.signatures = {}
-        msg = "base implementation will eventually ignore annotations as `singledispatch` does"
-        with contextlib.suppress(NameError, AttributeError, TypeError):
-            hints = signature.from_hints(func)
-            if hints and all(map(issubclass, hints, hints)):
-                warnings.warn(msg, DeprecationWarning)
-        super().__init__(func)
+        self[()] = func
 
     def __get__(self, instance, owner) -> Callable[..., RETURN]:
         return self if instance is None else types.MethodType(self, instance)  # type: ignore

tests/test_dispatch.py

@@ -99,8 +99,8 @@ def func(a: int, b: float = 0.0):
     assert method(0, 1.0) == method(0, b=1.0) == 1.0
     with pytest.raises(DispatchError, match="0 methods"):
         method(0, 0)
-    with pytest.raises(DispatchError, match="0 methods"), pytest.warns(DeprecationWarning):
-        multidispatch(func)(0, b=1)
+    assert multidispatch(func)(0, b=1)
+    assert multimethod(bool)(1)
 
 
 def test_keywords():
@@ -118,7 +118,6 @@ def _(arg: int, extra: float):
 
     assert func(0) is func(arg=0) is int
     assert func(0, 0.0) is func(arg=0, extra=0.0) is float
-    assert multidispatch(bool)(1)
 
 
 def test_concurrency():