Use a Hash for caching things #126
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Using ivars will not perform quite as well as a hash, and besides that if we use a hash we don't need to keep track of the "keys" that were set in a different data structure (as the hash keeps track of it for us)
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Using ivars will not perform quite as well as a hash, and besides that
if we use a hash we don't need to keep track of the "keys" that were set
in a different data structure (as the hash keeps track of it for us)