If you follow the mantra of 'code is data' then you have arbitrary and difficult to debug execution anywhere you have data. Mixing the two intentionally is a

If you follow the mantra of 'code is data' then you have arbitrary and difficult to debug execution anywhere you have data. Mixing the two intentionally is a blunder of creating software that seems to be repeated over and over, maybe because people keep encouraging it without realizing the cost in non trivial projects.