Add fudged tests for problematic representation-breaking radix literals

S02-literals/radix.t

@@ -1,7 +1,7 @@
 use v6;
 use Test;
 
-plan 134;
+plan 135;
 
 # L<S02/General radices/":10<42>">
 is( :10<0>,   0, 'got the correct int value from decimal 0' );
@@ -202,6 +202,11 @@ is( :2<1.1> * :2<10> ** :2<10>,             6, 'multiplication and exponentiatio
 
     is :100[10,10],      1010, "Adverbial form of base 100 integer works";
     is :100[10,'.',10], 10.10, "Adverbial form of base 100 fraction works";
+
+    # Representation-stressing large radix.  Do two tests in one here
+    # so both 32-bit and 64-bit machines are likely to fail uniformly.
+    #?rakudo todo "This needs an RT"
+    is :18446744073709551616[1,1] ~ " " ~ :4294967296[1,1], "18446744073709551617 4294967297", "32bit and 64bit large radix literals work";
 }
 
 # What follows are tests that were moved here from t/syntax/numbers/misc.t