SIMD-0359: Poseidon Syscall - Enforce Input Length

SIMD-0359 (Poseidon Syscall - Enforce Input Length) is a Core Standard Solana Improvement Document by Michal Rostecki; proposal status Activated.

Active on mainnet-beta since epoch 940; active on testnet since epoch 906; active on devnet since epoch 1014.

Feature gates

• Feature gate: SIMD-0359: Enforce padding in Poseidon hash inputs
• Related gate: Enable Poseidon syscall

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