Rexle is incorrectly parsing XML containing a comment

To reproduce this bug I am using the latest version of Rexle from the development environment.
The code declaration is as follows:

    require 'requestor'
    eval Requestor.read('http://rorbuilder.info/r/ruby'){|x| x.require 'rexle'}

## Expected
    doc2 = Rexle.new("<a><!--<b>123</b>--><b2>456</b2></a>")
    doc2.xml
    #=> "<?xml version='1.0' encoding='UTF-8'?>\n<a><!--<b>123</b>--><b2>456</b2></a>"

## Actual
    doc2 = Rexle.new("<a><!--<b>123</b>--><b2>456</b2></a>")
    doc2.xml
    #=> "<?xml version='1.0' encoding='UTF-8'?>\n<a><!--<b>123<b2>456</b2></!--<b></a>"

Note: If I remove the comment it works as expected.

rexle comment tag parsing