Roy T. Fielding wrote:
There is no reason to require any particular comparison algorithm. One application is going to compare them the same way every time. Two different applications may reach different conclusions about two equivalent identifiers, but nobody cares because AT WORST the result is a bit of inefficient use of storage.
It is worse than that. To give a concrete example: Radio Userland's aggregator will not present to you an item that you have seen before, no matter how different the current content is.
- Sam Ruby
