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Level 22 · ◆◆ · ~11 min

The Semantics That Bite

The Semantics That Bite

"The bugs that look like bad data: aliasing, mutable defaults, integer division and the comparisons that lie."

mutable default argumentsaliasing and copy semanticsinteger division and truncationidentity vs equality
🚀 You're jumping ahead. This builds on Vectorising, and When Not To — but play it now and you'll still earn full XP. If it feels steep, those make a gentler on-ramp.

A short lesson, then a quiz. ❤️×3 — a wrong answer costs a heart; finish with at least one left and the level is yours. Lose all three and you'll have to try again. Replay any time — XP and cleared levels are never lost.