- // We can convert any vector of digits into a number, by removing trailing zeros. The `mut`
+ // Any vector of digits, which meets the structure of BigInt's `data` field, can be easily
+ // converted into a big number just by removing trailing zeros. The `mut`
// declaration for `v` here is just like the one in `let mut ...`: We completely own `v`, but Rust
// still asks us to make our intention of modifying it explicit. This `mut` is *not* part of the
// type of `from_vec` - the caller has to give up ownership of `v` anyway, so they don't care anymore
// declaration for `v` here is just like the one in `let mut ...`: We completely own `v`, but Rust
// still asks us to make our intention of modifying it explicit. This `mut` is *not* part of the
// type of `from_vec` - the caller has to give up ownership of `v` anyway, so they don't care anymore