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Go is what I reach for if my other options might be Java or Python but I don’t want deployment and support to be really stupid and awful.

Rust’s close alternative is C++. Maybe also C? I don’t know if Rust can fill its niche of ultra-portable libraries that are relatively easy to import and use in tons and tons of other languages & systems.

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Other than LLVM portability concerns, I think Rust can for sure replace C/C++ libraries (I'm talking DLLs etc).

Sure, there will be a small C ABI shim but the developer experience writing in Rust I think is worth it.

Also, nowadays whenever I want to write a fast Python extension, I don't think twice before using pyo3, super simple to write and build.

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