fix(StdCheats): enable packed slots when dealing token balances - #888
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fix(StdCheats): enable packed slots when dealing token balances#888Yonkoo11 wants to merge 2 commits into
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July 11, 2026 21:18
przyluc012404-netizen
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Jul 18, 2026
Tokens that pack balance into a shared storage word (USDC-class, Optimism sUSD) fail stdstore find without packed mode. Use enable_packed_slots() for ERC20/1155/721 balance writes so deal updates only the balance bits and preserves neighboring data. Fixes foundry-rs#293
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Friendly follow-up: this is rebased, the full CI matrix is green, and the packed-balance regression test verifies neighboring storage remains intact. Happy to adjust anything needed for review. |
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Summary
dealwrote balances throughstdstorewithout packed mode. Tokens that store balance in a packed slot (e.g. post-upgrade USDC, Optimism sUSD) failfindor would clobber neighbor fields. Useenable_packed_slots()for balance writes indeal/dealERC1155/dealERC721.Linked issue
Fixes #293
Test plan
test_Deal*suite passestest_DealTokenPackedBalance(balance in low 128 bits; high bits preserved)AI assistance
Prepared with AI assistance; I reviewed and tested the change.
Risk
Packed mode is slightly more expensive on find. Unpacked ERC20s still work (covered by existing tests).