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> Shouldn't that be completely opaque to the user?

That would have been nice indeed. However many languages use lots of memory and are a bit slow, or are security-dangerous like C. It's nice to know, then, that this app likely uses barely any memory at all, and is as fast & keyboard-responsive as it can be, and harder to hack — Rust. (Assuming it is implemented in a good way :- ))

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If it's faster or uses less memory, that's something that can be easily measured.

If it's more secure, that's harder to measure. But that's not even the tagline, just that it's written in Rust.

I wrote "or are security-dangerous like C" actually,

— that's easy to measure, if it's written in C or not (or some other memory unsafe language)

The implementation matters a good deal more than the programming language.

The programming language is a pretty substantial part of the implementation, though, if not the most substantial one. Rust is qualitatively different than a language like C (in that it is memory safe) or Python (in that it is compiled and fast).

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