> At what point does it really stop mattering if this is C or Rust? If I read TFA correctly, they came up with a library that is API compatible with the C one,

> At what point does it really stop mattering if this is C or Rust? If I read TFA correctly, they came up with a library that is API compatible with the C one, but they've measured to be faster. At that point I think in addition to safety benefits in other parts of the library (apart from unsafe micro optimizations as quoted), what they're leveraging is better compiler technology. Intuitively, I start to assume that the rust compiler can perhaps get away with more optimizations that might not be safe to assume in C.