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To call the constructor we now only store the CE and a HashTable for the arguments. This reduces the size of the _pdo_stmt_t struct from 320 bytes to 232 bytes. Moreover, this now means that the constructor argument array follows the usual CUFA semantics. This change is a BC break, as string keys now act like named arguments. Moreover, the automatic wrapping of by-value arguments for by-ref parameters has been dropped, and the usual E_WARNING is now emitted in those cases. The do_fetch() is heavily refactored to simplify the execution flow, which also makes it easier to understand. Additionally we add a new bitflag in_fetch to prevent modification of the fetch flags by userland when PDO is fetching from the DB.