Value vs. Reference Semantics, see:


* ImmutableValue
* ValueObject
* ValueObjectHypotheses
* ValueObjectsCanBeMutable
* ValueObjectsShouldBeImmutable
* ValueObjectsShouldBePassedByValue
* ValueSemantics

Also, what should ( #( 1 2 3) asSet = #( 1 3 2) asSet ) answer? ''Looks like assignment to me ;)''