Return a FixPoint with a value equal to the difference between this FixPoint and the argument. The operation is lossless and will "expand" the Precision of the resulting FixPoint value to include the full precision of the result. This operation will operate on either signed or unsigned fixed values. If either of the operations are signed, the result will be signed. If both operands are unsigned and the result is positive, an unsigned value will be produced. If both operands are unsigned and the result is negative, a signed value will be generated.
@param arg The FixPoint subtrahend.
@return The FixPoint difference.
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