Returns TRUE if FXP includes an overflow status and FXP is the result of an operation that overflowed. Otherwise, this function returns FALSE.
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FXP specifies a fixed-point number.
overflow? is TRUE if FXP includes an overflow status and FXP is the result of an operation that overflowed. If FXP does not include an overflow status, or if FXP includes an overflow status but is not the result of an operation that overflowed, overflow? is FALSE.