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On 30/09/2011 11:48, Andrew Welch wrote:
() = () returns false it can be sort of justified deep-equals tries to tell you if the sequences passed in as arguments are equal or not and () and () being the same are equal as sequences. eq and = never consider the sequence as a whole, they only consider individual items eq just considers single items and (because if sql heritage, probably, empty sequences) so returns () when given (). = is an existential quantified comparison and the answer to "is there an item in the first sequence equal to an item in the second" is trivially false, since there are no items, so = returns false. So, each operator (with the possible exception of eq, which would perhaps most naturally have been defined to be an error on () eq () ) has a natural justification, and so the user will never be confused and order is restored to the universe... David
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