testSerdeWebPage failure - PersistentBase#equals() fails with map fields

junit.framework.AssertionFailedError: expected:<org.apache.gora.examples.generated.WebPage@4b49ab6f {
  "url":"http://bar.com/"
  "content":"java.nio.HeapByteBuffer[pos=1 lim=1 cap=1]"
  "parsedContent":"[1]"
  "outlinks":"{http://bazbar.com=a8, http://baz.com/1.jsp&q=barbaz&p=foo=a6, http://baz.com/1.jsp&q=barbaz=a5, http://bar.com/3.jsp=a3, http://bar.com/1.html=a4, http://foo.com/1.html=a1, http://foo.com/2.html=a2, http://baz.com/1.jsp&q=foo=a7}"
  "metadata":"org.apache.gora.examples.generated.Metadata@51a {
  "version":"1"
  "data":"{metakey=metavalue}"
}"
}> but was:<org.apache.gora.examples.generated.WebPage@4b6d94c0 {
  "url":"http://bar.com/"
  "content":"java.nio.HeapByteBuffer[pos=0 lim=1 cap=1]"
  "parsedContent":"[1]"
  "outlinks":"{http://baz.com/1.jsp&q=barbaz=a5, http://baz.com/1.jsp&q=barbaz&p=foo=a6, http://bazbar.com=a8, http://bar.com/3.jsp=a3, http://foo.com/1.html=a1, http://bar.com/1.html=a4, http://foo.com/2.html=a2, http://baz.com/1.jsp&q=foo=a7}"
  "metadata":"org.apache.gora.examples.generated.Metadata@51a {
  "version":"1"
  "data":"{metakey=metavalue}"
}"
}>
	at junit.framework.Assert.fail(Assert.java:50)
	at junit.framework.Assert.failNotEquals(Assert.java:287)
	at junit.framework.Assert.assertEquals(Assert.java:67)
	at junit.framework.Assert.assertEquals(Assert.java:74)
	at org.apache.gora.util.TestIOUtils.testSerializeDeserialize(TestIOUtils.java:125)
	at org.apache.gora.mapreduce.TestPersistentSerialization.testSerdeWebPage(TestPersistentSerialization.java:85)