[S02] polymorphic types are speculative at best

mark them as conjectural

Author: moritz

S02-bits.pod

@@ -14,7 +14,7 @@ Synopsis 2: Bits and Pieces
     Created: 10 Aug 2004
 
     Last Modified: 09 Apr 2012
-    Version: 253
+    Version: 254
 
 This document summarizes Apocalypse 2, which covers small-scale
 lexical items and typological issues.  (These Synopses also contain
@@ -1741,7 +1741,7 @@ allowed as a synonym):
     my sub get_book ($key) of Hash of Array of Recipe {...}
     my sub get_book ($key) returns Hash of Array of Recipe {...}
 
-=head2 Polymorphic types
+=head2 Polymorphic types (Conjectural)
 
 Anywhere you can use a single type you can use a set of types, for convenience
 specifiable as if it were an "or" junction: