+2005-06-09 Tilman Sauerbeck (tilman at code-monkey de)
+ * ext/ext.c: Object#to_eet: Don't put the final chunk in a stream
+ again, it's not needed
+ * ext/ext.c, test/test_stream.rb: If Stream#serialize is called on
+ a stream that includes non-Chunk elements, BadElementError is
+ raised
+