Update BankAdapter.sol: Using 'immutable' for keccak variables #1
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It's usually a gas saving practice to use
immutable
for keccak variables rather thanconstant
This explains better -> https://gist.github.com/grGred/9bab8b9bad0cd42fc23d4e31e7347144#change-constant-to-immutable-for-keccak-variables