* this is seven bits to the left of its usual location. The shifted significand
* must be normalized or smaller than this. If it's not normalized then the exponent
* `exp_z' must be zero; in that case, the result returned is a subnormal number
- * and is must not require rounding. In the more usual case where the significand
+ * which must not require rounding. In the more usual case where the significand
* is normalized, the exponent must be one less than the *true* exponent.
*
* The handling of underflow and overflow is otherwise in alignment with IEC/IEEE.