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     Specifying this directive causes extra code to be generated to ensure
     that numeric fields contain valid data before any operations are
     performed on them. With CHECKNUM set, run-time error message 163
     (Illegal charcacter in numeric field (fatal)) is displayed if any
     numeric field is found to contain non-numeric data. This error can be
     disabled using the -F RTS switch.
 
     Specifying CHECKNUM causes extra code to be produced, reducing the
     efficiency of your programs. For smaller, faster code you should not
     specify CHECKNUM.
 
     See also ◄-F RTS switch►
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