/* use_pack() assures us we have [base, base + 20) available
* as a range that we can look at at. (Its actually the hash
- * size that is assurred.) With our object header encoding
+ * size that is assured.) With our object header encoding
* the maximum deflated object size is 2^137, which is just
* insane, so we know won't exceed what we have been given.
*/