A general problem with "clever code" is that it's infrequently "optimal". And, by "optimal", I don't limit the evaluation scope to traditional measures like speed of execution, resource-consumption, etc. versus other methods. I mean, because it's "clever", it is frequently hard to maintain — especially from the standpoint of handing stuff down.
Sadly, I'm a frequent flyer on the "so terse/compact/dense no one else can maintain it" side of "clever code". On the plus side, it affords the opportunity to teach others new methods ...but the time lost to having a second person having to track the originator down to teach them how to interpret, replicate and/or improve on the code renders it no longer optimal when measured in (expensive) man-hours consumed.
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