This and the other comment under this seem to be talking about the work the computer is doing at runtime. I believe the point is about the developer's work in implementing this. (For example, renaming potentially conflicting variables is clearly _less_ work than renaming only the actually conflicting variables, in this framing.) This kind of work is important for (1) compilers whose bugs are potentially very financially expensive, and (2) compilers with very intentionally-portable implementations (including but not limited to educational implementations)
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