setbinary
wks.col.setbinary([1])
Set binary auto convert. wks.col.setbinary(1) to detect values and can fail if column has more than two distinct values. The two values found are converted such that the larger become 1 and smaller 0. If no argument or not 1, it will work the same as wks.col.format=9 and will convert only valid binary values and set missing values otherwise.
wks.col.format