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Mathematica

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    $\begingroup$ I guess I have to state the obvious here and that is using undocumented functions/options can break with major or even minor mathematica upgrades. My advice is to stay away unless you like to experiment and have a lot of time on your hands. $\endgroup$ Commented Jan 27, 2012 at 15:45
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    $\begingroup$ J.M. mentioned Internal`FromPiecewise in (27254) if anyone feels like writing an answer about it. $\endgroup$ Commented Apr 13, 2015 at 17:07
  • $\begingroup$ @Kuba, Is it possible to edit this question to the style of community wiki? $\endgroup$ Commented May 7, 2015 at 8:23
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    $\begingroup$ I don't know. No need for that on the other hand, this is a good question. $\endgroup$ Commented May 7, 2015 at 8:25
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    $\begingroup$ I would add Internal`AbsSquare. So much time lost computing the square root in Abs or Norm just to undo it a moment later in quantum mechanical calculations. $\endgroup$ Commented Apr 4, 2016 at 15:49