isomorphic.rb in rdf-isomorphic-0.1.2

- old
+ new

@@ -30,10 +30,12 @@
     #     repository_a.bijection_to repository_b
     # @param other [RDF::Enumerable]
     # @return [Hash, nil]
     def bijection_to(other)
 
-      grounded_stmts_match = each_statement.all? do | stmt |
+      grounded_stmts_match = (size == other.size)
+
+      grounded_stmts_match &&= each_statement.all? do | stmt |
         stmt.has_blank_nodes? || other.has_statement?(stmt)
       end
 
       if grounded_stmts_match
         # blank_stmts and other_blank_stmts are just a performance