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Also, leaking memory with reference cycles from shared ownership

This seems to be a problem that even Swift can’t solve. The only languages that avoid this issue are ones with active GCs. Not that I don't agree and wouldn't love to see efforts made here.

It'd be possible to add an active GC to Rust. There are some library attempts at that:

- https://lib.rs/crates/gc

- https://github.com/withoutboats/shifgrethor

But they don't look particularly usable.

Beyond that, yeah, it sucks.

There are local cycle collection algorithms, but Rust doesn't expose enough metadata to write them in Rust itself. They're also not cheap to run.

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