If many top notch computer programmers, in a field where people are largely selected for their ability to understand causes and consequences, fail to understand the difference between a constant and a variable with respect to a given choice, how can you expect people from professions that don't thus select their members to fathom the difference?

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I am always amazed when people fail to distinguish between constants and variables. I am all the more amazed when the victims of such confusion are the otherwise brilliant implementers of programming languages. You'd think that if anyone knows the difference between a variable and a constant, it would be a programming language implementer.
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