Swap out `mutable-containers` dependency for `unboxed-ref`

[mitchellwrosen]

Hi! I've prepared a PR to swap out the mutable-containers dependency for unboxed-ref, in case the maintainers here are interested.

The primary motivation is to reduce the dependency footprint.

Before:

After:

Although the unboxed-ref source has not been touched in 5+ years, I checked out the implementation and it looks solid. It also doesn't have any out-of-date dependencies on Hackage.

[ocramz]

@mitchellwrosen this is a good change, did you also look at the respective benchmarks? since xeno is supposed to be performance-oriented, I mean.

[mitchellwrosen]

Unfortunately I did not, but I think they should remain unchanged since the implementation of unboxed refs is the same (using a one-element MutableByteArray#).

The benchmarks seem to require an expat system library, and I don't know what that is :sweat_smile:

[mitchellwrosen]

@ocramz Were you waiting to confirm that benchmarks haven't moved before merging?

[ocramz]

I kind of was! TBH haven't even had the time to try this out.

On Fri, 24 Feb 2023 at 21:03, Mitchell Rosen @.***> wrote:

@ocramz https://github.com/ocramz Were you waiting to confirm that benchmarks haven't moved before merging?

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[mitchellwrosen]

Ok. Well, I'm unfortunately not able to run the benchmarks, so feel free to close or merge whenever you are comfortable.