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Off the top of my head I don't know. It wouldn't surprise me if there is a version written (or being written) in Rust. There may be many more small scale projects that are in various states of functionality.
In principle though, there is nothing to stop any language being used except for the effort required by developers.
Yeah, the only reason for not pushing for more implementations is that it leads to higher chances for bugs.
I'm ok with LN having compatibility issues between implementations, much less for it to happen at the base layer.
In principle though, nothing to stop other languages for other implementations, indeed.
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