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  • Thank you! I finally fully understand the difference between those two terms. Also, thanks for the guidelines for further study :) Commented Jun 27, 2023 at 17:26
  • Mutable numbers: In Fortran IV constants passed as parameters could be mutated. So I could change 2 to 4, and the result of adding 1+1 would be 4 :-( It was a horrible problem in the language definition, not a compiler bug. Commented Jun 28, 2023 at 15:54