3.1.2 Hash functions

Different hash functions are not required to return the same hash code for equal or even identical objects. For instance,

collection-hash(#(), object-hash, object-hash);

is not guaranteed to return the same values as

sequence-hash(#(), object-hash);

Furthermore, collection-hash with ordered: #t is not guaranteed to return the same hash code as collection-hash with ordered: #f. Such a requirement would render the ordered: keyword useless.

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Common Dylan and Functional Extensions - 31 Mar 00