Explain Starknet storage cost optimization, packing values, and bitwise operations; use when a request involves reducing storage slots or implementing packed storage in Cairo.
SKILL.md
Cairo Storage Optimization
Overview
Show how to reduce storage costs by packing multiple values into one slot and manipulating bits safely.
Quick Use
Read references/storage-optimization.md before answering.
Use shift and mask operations with core::integer::bitwise or arithmetic.
Mention StorePacking for automatic packing where appropriate.
Response Checklist
Ensure packed values fit within 251 bits total.
Use explicit masks and shifts for extraction.
Consider a custom struct with StorePacking for reusable packing logic.
Example Requests
"How do I pack two u128 values into one storage slot?"
