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1.142.3 RootNamespace: overrides for superspaces

Answer a Set of all the keys in the receiver and its superspaces

set: key to: newValue ifAbsent: aBlock
Assign newValue to the variable named as specified by `key'. This method won't define a new variable; instead if the key is not found it will search in superspaces and evaluate aBlock if it is not found. Answer newValue.