Oracle XMLType: exctractvalue vs. extract

I always thought that

exctarctvalue(xml, '/Node')

is equivalent to

xml.extract('/Node/text()').getstringval()

Usually it is true, but in some cases it is not. When node contains special characters like &, >, < etc... then results are different. Let me give an example:

SQL> set define off
SQL> select aa.a.extract('Node/text()').getStringVal() extr
  2       , extractvalue(aa.a, 'Node') extractval
  3    from (select XMLRoot(
  4              XMLElement("Node", 'test & < and >'),
  5             VERSION '1.0') a from dual) aa;

EXTR
----------------------------------------
EXTRACTVAL
----------------------------------------
test &amp; &lt; and &gt;
test & < and >

First look on documentation even confirms my expectations:
"extractValue – This takes an XPath expression and returns the corresponding leaf node. The XPath expression passed to extractValue should identify a single attribute or an element that has precisely one text node child. The result is returned in the appropriate SQL data type. Function extractValue is essentially a shortcut for extract plus either getStringVal() or getNumberVal()."
XML DB Developer's Guide - b14259.pdf page 1-17.

But there is small note on that:
"Note: Function extractValue and XMLType method getStringVal() differ in their treatment of entity encoding. Function extractValue unescapes any encoded entities; method getStringVal() returns the data with entity encoding intact."
XML DB Developer's Guide - b14259.pdf page 4-10.

Cheers, Paweł