Copies a RAW or MEMPTR variable to the specified location in another RAW or MEMPTR variable.
For a RAW variable, if position is greater than the length of destination, the AVM increases the length of destination to position plus the remaining bytes needed to store expression. The gap between the original destination length and position is padded with null bytes.
For a MEMPTR variable, if position is greater than the length of destination or does not leave sufficient room to store expression, the AVM generates a run-time error. If destination is a RAW and position plus the length of expression is greater than 32K, the AVM generates a run-time error.