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re-adds the original implementation back (CurveTricryptoOptimizedWETH.vy) which is the implementation that allows native token transfers. Adds an additional implementation contract (CurveTricryptoOptimized.vy) that disallows native token transfers, has exchange_received, does not expose claim_admin_fees, and fees are collected in individual tokens.
The original tricrypto-ng implementation CurveTricryptoOptimizedWETH is at index 0 of all factories. the new tricrypto-ng implementation CurveTricryptoOptimized is at index 1, but only for factories that are not on Ethereum. This is because of a small bug in the ethereum factory where there is no getter for pool's implementation contract address, but it exists for layer2 factories.
Users can still create AMM pools without native token transfers by setting _weth to zero address.