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1.217.2 WeakValueLookupTable: hacks

at: key ifAbsent: aBlock
Answer the value associated to the given key, or the result of evaluating aBlock if the key is not found


at: key ifPresent: aBlock
If aKey is absent, answer nil. Else, evaluate aBlock passing the associated value and answer the result of the invocation


includesKey: key
Answer whether the receiver contains the given key.