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Depending on whether the input URI is http://www.google.com or http://www.google.com/ one gets different graphs in the Notation3 output, namely earl:testSubject <http://www.google.com> versus earl:testSubject <http://www.google.com/> which is rather undesirable. URI->canonicalize(...) would prevent that.
Uhm. AFAIK, the two URLs are entirely equivalent. Why would this be a problem (in n3 or otherwise)? Canonic URLs is probably a good idea on general principle, but you seem to be implying a specific bug here?
They are not equivalent when compared as strings which is how things work in RDF, as I wrote, you have two different graphs which is undesirable. This does not violate some protocol, but should be fixed nonetheless.
Fixed in HEAD.