Auto merge of #9954 - gilescope:lev_tighten, r=ehuss
Auto merge of #9954 - gilescope:lev_tighten, r=ehuss

nit: Allocated slightly bigger vec than needed

I think this is slightly more correct as the rest of the algorithm is focusing on chars not bytes, so this is more consistent.

nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,eminence/cargo,nipunn1313/cargo,rust-lang/cargo,rustyhorde/cargo,rust-lang/cargo,rustyhorde/cargo,eminence/cargo,rustyhorde/cargo,rust-lang/cargo,eminence/cargo,eminence/cargo,nipunn1313/cargo,nipunn1313/cargo