Parameter Passing
Arguments to routines are always passed by value; there is no pass-by-reference facility. However, parameters are allowed to be modified locally (i.e. within the callee) which is implemented very efficiently as sequences have automatic copy-on-write semantics. In other words, when you pass a sequence to a routine, initially only a reference to it is passed, but at the point the routine modifies this sequence parameter the sequence is copied and the routine updates only a copy of the original.
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