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  {$R<+│->}
 
  Description
 
    Switches on or off range checking of values used in array
    indexing, assignments, and parameter passing. The default
    is {$R+}.
 
    {$R+}  Checks if assignments to variables of scalar and subrange
           types are within declared bounds; also checks array and
           indexed-string expressions. If a declared range is overrun,
           the program is terminated with a run-time error message.
 
    {$R-}  Turns off {$R+}.
 
    Use Range Checking while debugging to detect values that venture
    out of their declared range. Disable it in final versions for
    smaller, faster code.