perl-Data-Constraint

A constraint is some sort of condition on a datum. This module checks one condition against one value at a time, and I call the thing that checks that condition the "constraint". A constraint returns true or false, and that's it. It should have no side effects, it should not change program flow, and it should mind its own business. Let the thing that calls the constraint figure out what to do with it. I want something that says "yes" or "no" (and I discuss why this needs a fancy module later).

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