[S03] make infix:<%> be rational if possible

S03-operators.pod

@@ -14,8 +14,8 @@ Synopsis 3: Perl 6 Operators
 
     Created: 8 Mar 2004
 
-    Last Modified: 04 Jun 2014
-    Version: 274
+    Last Modified: 06 Jun 2014
+    Version: 275
 
 =head1 Overview
 
@@ -812,6 +812,10 @@ then calculates the remainder, which is defined as:
 
     $x % $y == $x - floor($x / $y) * $y
 
+If both operands are of integer or rational type, the operator returns the
+corresponding C<Rat> value (except when the result does not fit into a
+C<Rat>, as detailed in L<S02>).
+
 =item *
 
 C<< infix:<%%> >>, is divisible by