fix bug w/ kwonly parameter & notrequired typeddict item

Summary:
Handle a case that gave a weird error in python/typing#1918

Keyword only parameters were always treated as not having defaults, which made them incompatible with notrequired typeddict items.

Reviewed By: rchen152

Differential Revision: D69222079

fbshipit-source-id: 5f4ac60d5bc3f7fa5da4b3709f0364f21f8d94aa

Author: yangdanny97

source/analysis/signatureSelection.ml

@@ -1157,6 +1157,7 @@ let check_arguments_against_parameters
         let has_default =
           match parameter with
           | Named { default; _ } -> default
+          | KeywordOnly { default; _ } -> default
           | _ -> false
         in
         let rec check ~arguments signature_match =

source/analysis/test/integration/typedDictionaryTest.ml

@@ -2584,6 +2584,19 @@ class Movie(TypedDict, total=False):
 def foo(name: str = "") -> None:
   pass
 kwargs: Movie = {"name": "Life of Brian"}
+foo(**kwargs)
+            |}
+           [];
+      labeled_test_case __FUNCTION__ __LINE__
+      @@ assert_type_errors_inject_typing_and_typing_extensions
+           {|
+from typing import TypedDict
+from typing_extensions import Unpack
+class Movie(TypedDict, total=False):
+    name: str
+def foo(*, name: str = "") -> None:
+  pass
+kwargs: Movie = {"name": "Life of Brian"}
 foo(**kwargs)
             |}
            [];