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env and args tainting tests:
1. =
	 some <a href="/?a&b">html</a> code 
	 _2A _3F _22 _7C 
	 some  <?dirty?>  code  trailing whitespace here ->   =
2. ="args" "
	 some &lt;a href=&quot;/?a&amp;b&quot;&gt;html&lt;/a&gt; code 
	 _2A _3F _22 _7C 
	 some  <?dirty?>  code  trailing whitespace here ->   " =
3. ="args" ""quo ted"" =
4. ="args" "un"quo ted"" "%PATH%" "some\ 
 - enter?" =