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📜 WAYPOINT LESSON

Checkpoint: memory model

⭐⭐⭐ advanced⏳ 12 min read📍 Lesson 166 of 265

Synthesis: copy/alias decisions, span slicing, and a measured allocation budget.

Checkpoint: memory model

The graded task forces the copy/alias decision explicitly (struct copy vs ref alias, both observable), then audits the whole method with the allocation probe — the pattern is: right answer AND right budget. Practice adds zero-allocation span parsing, defensive-copy reasoning, and a strict allocation budget on two competing implementations.