$scrubber->default(1) allows the tags ('a' etc.) but not the tag's attributes ('href' etc.). To allow the 'href' attribute you need to change it to:

# allow href
$scrubber->default(1,{'href'=> 1});

# or allow all tag attributes
$scrubber->default(1,{'*'=> 1});
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and it's more like a doorman than a WMD :)