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Parse ² and ³ as one would expect in the calc command

Michael Aaron Murphy requested to merge mgmoens:master into master

Created by: mgmoens

Problem: ² and ³ are obvious mathematical characters (my terminal even changes ^2 into ²), but triggered errors in calc.

Solution: Added two specific tokens, square and cube, to the calc tokens.

Changes introduced by this pull request:

  • Added these tokens and added some code in the exponentiation fn.

Drawbacks: I think none.

TODOs: Maybe write a test?

Fixes: None. I was playing around in calc and noticed this.

State: Ready.

Blocking/related: I think none.

Other: None

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