The new [Localize] function safely converts a slash-separated

The new [Encode] and [Decode] functions are byte slice equivalents
to [Read] and [Write].

As a release cycle nears completion, run `relnote todo` to get a list of
unfinished release note work.

To prepare the release notes for a release, run `relnote generate`.
That will merge the `.md` files in `next` into a single file.
Atomically (as close to it as possible) add that file to `_content/doc` directory
of the website repository and remove the `doc/next` directory in this repository.

  a slice backward.
- [Collect](/pkg/slices#Collect) collects values from an iterator into
  a new slice.
- [AppendSeq](/pkg/slices#AppendSeq) appends values from an iterator to
  an existing slice.
- [Sorted](/pkg/slices#Sorted) collects values from an iterator into a
  new slice, and then sorts the slice.
- [SortedFunc](/pkg/slices#SortedFunc) is like `Sorted` but with a
  comparison function.

The [CopyFS] function copies an [io/fs.FS] into the local filesystem....