On: Zlib-rs is faster than C

[datadeft]

True, however I only saw this happens to achieve max perf. I have very limited experience so this is confirmation bias from my end.

[steveklabnik → datadeft]

An example of unsafe not for performance is when interacting with hardware directly.

[ycombinatrix → steveklabnik]

or the operating system!

opening stdout with file handle 0 is not guaranteed safe by the compiler. there's an "unsafe" somewhere in there.