[PATCH 8 of 8] localrepo: implement persistent tag caching

[timeless]

> +    to restore old behaviour with minimal code change."""

mercurial usually writes behavior without a u (64:5)

> +    # The tag cache stores only info about heads, not the tag contents

stores only => only stores

> +    # performance, but it is simpler has a better chance at actually

it is simpler => this is simple and
at => of

> +    # strip/rollback and tag rank.  I suspect the only way to get it

I'm too lazy to check to see if it's common for mercurial comments to
speak in the first person, so I'll just ask :).