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Chore: Update to SputnikVM version 0.38.3 (#826)
## Description Updates to the latest version of SputnikVM. There are two improvements: - A fix to a bug in the `returndatacopy` op code implementation. - An improvement in performance of accessing the EVM memory. ## Performance / NEAR gas cost considerations Several gas costs went down a little due to the improved performance in accessing the EVM memory. For some reason this also causes the EVM gas cost of the promise results precompile to increase. I am not sure why, but it's only a small increase (recall that any EVM transaction must spend at least 21000 gas), so I think's ok. ## Testing New regression test for the `returndatacopy` bug. New regression test for the EVM memory performance.
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