Zfs dedup on /nix/store -- Is it worth it?

Recently I’m experimenting with several zfs features, I learned that zfs can do block level deduplication.
Has anyone tried it on /nix/store?
Since we already have nix optimise-store, can I still benefit from the block level deduplication?
The deduplication implementation of zfs lowered the write performance, but /nix/store is read-only in most of time, I think it doesn’t matter, am I right about that?