Core: Support default value with cache_self1 (#4667)

* add cache_self1_default and tests

* merge the two decorators

* just change the defaults of the wrap lol

* add test for default and default

Utils.py

@@ -114,6 +114,8 @@ def cache_self1(function: typing.Callable[[S, T], RetType]) -> typing.Callable[[
             cache[arg] = res
             return res
 
+    wrap.__defaults__ = function.__defaults__
+
     return wrap
 
 

test/utils/test_caches.py

@@ -35,6 +35,19 @@ class TestCacheSelf1(unittest.TestCase):
         self.assertFalse(o1.func(1) is o1.func(2))
         self.assertFalse(o1.func(1) is o2.func(1))
 
+    def test_cache_default(self) -> None:
+        class Cls:
+            @cache_self1
+            def func(self, _: Any = 1) -> object:
+                return object()
+
+        o1 = Cls()
+        o2 = Cls()
+        self.assertIs(o1.func(), o1.func())
+        self.assertIs(o1.func(1), o1.func())
+        self.assertIsNot(o1.func(2), o1.func())
+        self.assertIsNot(o1.func(), o2.func())
+
     def test_gc(self) -> None:
         # verify that we don't keep a global reference
         import gc