The point is that those terms are ambiguous ... and if you mean the length in grapheme clusters, it can be quite expensive to calculate it, and isn't the right number if you're dealing with strings as objects that are chunks of memory.
If the validation rules don't specify (either explicitly or implicitly) what the "length" in the rule corresponds to (if it concerns a natural-language field, it's probably grapheme clusters), then either you should fix the rule, or you care only about checking the box of "I checked the validation rules", in which case it's a people problem and not a technology problem.
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