Incorrect attr-no-duplication warnings?

[seanw]

Test cases that can be ran on http://htmlhint.com/

<!-- I would expect this to produce no warnings but all lines produce "The name of attribute [ rel ] been duplication." warning -->
<link rel=icon><link rel=icon>
<link rel=icon><link rel='icon'>
<link rel=icon></link><link rel=icon></link>
<link rel=icon/><link rel='icon'/>

<!-- This produces no warnings as I would expect. The extra space and quotes seem to make a difference -->
<link rel=icon> <link rel=icon>
<link rel='icon'><link rel=icon>

The first two lines of code are typical from minifiers so this warning is problematic for me as the rule is firing a lot. Thanks for the great library by the way!