TOINTEXACT function consumes one NUMBER from the top of the stack and puts back the value. If the result overflows an INT, this function fails.
Since 2.6.0, this function can be applied to a list of numeric values. In this case, the function is applied to each element of the list thus returning a list.
Since 2.7.1, this function can be also applied to a GTS. In this case, the function is applied to each value of the given GTS, returning a new GTS.