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Basically, sometimes a web client will send 2 instances of the same name:

Cookie: mycookie=foo; mycookie=bar

The specs say that the first one is the one that should be used. The other 
cookies listed are the inherited ones from paths that a prefix of the current 
URL. When this is parsed by the Cookie module, mycookie gets set to bar 
when it should be foo.

Another example might be:

Cookie: mycookie=foo; path=bar
Cookie: mycookie=foo; path=baz

In this case there should be 2 cookies with the name 'mycookie'. The 
uniqueness is determined by the different paths.

Thanks.