Test Variable overwrites

A quick question on test variables -- if you overwrite a system-assigned test variable, I see that both are retained in the reserved variables list. I haven't permanently overridden any of those assigned variables to this point (even though more descriptive ones would fit my needs better) simply because I worry that I'm asking for trouble down the line. Is that a valid concern?


[Sorry for clogging the forum with two questions in a row, but they've both been nagging me for a few days and I didn't want to create confusion with two topics on the same post. Thanks!]

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