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Historically Curve pools have been using dev reasons for errors to reduce the impact on codesize due to EIP-170 limitations. However given the increasing amount of integrators for the cryptoswap algo, dev reasons have proven to be very hard to use for debugging for devs that are not using titanoboa.
Given twocrypto-ng has enough room to add onchain errors, I replaced all dev reasons with more tooling friendly onchain reverts.
This is part 3 of 3 in a stack made with GitButler: