bpo-33502: dataclass._Dataclassparams repr: use repr of each member. (GH-6812)

(cherry picked from commit 3059042410dce69806b94be72d5c8055d616f3a3)

Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>
diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index c60eeaa..2ce6a02 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -274,12 +274,12 @@
 
     def __repr__(self):
         return ('_DataclassParams('
-                f'init={self.init},'
-                f'repr={self.repr},'
-                f'eq={self.eq},'
-                f'order={self.order},'
-                f'unsafe_hash={self.unsafe_hash},'
-                f'frozen={self.frozen}'
+                f'init={self.init!r},'
+                f'repr={self.repr!r},'
+                f'eq={self.eq!r},'
+                f'order={self.order!r},'
+                f'unsafe_hash={self.unsafe_hash!r},'
+                f'frozen={self.frozen!r}'
                 ')')