Early versions of Pair.perl and Pair.Str.

src/core/Pair.pm

@@ -2,4 +2,17 @@ augment class Pair {
     method value() {
         $!value
     }
+
+    multi method perl() {
+        # $.key.perl ~ ' => ' ~ $.value.perl;
+        "Pair.new(:key({$.key.perl}), :value({$.value.perl}))";
+    }
+
+    # I don't see anything in the spec about what
+    # this should do.  This is doing the same thing
+    # that ~Pair did in old Rakudo master, which didn't
+    # seem to have Pair.Str.
+    multi method Str() {
+        "$.key\t$.value";
+    }
 }