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calldataloadwill load different data depending on the call frame, and will persist for an individual call frame, but not to the next call frame. E.g. if EOA callsfunction aoncontract A, andcontract Acallsfunction boncontract B, thecalldataloadwill no longer load the EOA's call data and will instead load the data used in the sub-call frame.function aoncontract Acallsfunction boncontract A, thecalldataloadwill still be the EOA's call data, correct?b()) or through a message call (message call, i.e.this.b(). The latter, in Solidity, will change thecalldataload, but the former wont. In Vyper, AFAIK, all calls to local functions (i.e. boththis.b()andb()) create a message call socalldataloadwill change.