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but the compiler doesn't *force* you to mark a function that contains `unsafe { ... }` as `unsafe`, you have to elect to do that? so `unsafe { ... }` is you going "look, I know rustc can't prove this memory use is ok, but trust me I know what I'm doing"
Right. `unsafe fn` is "this function has invariants which must be upheld (ideally well documented, which were not in the function in question). `unsafe { }` means "I have upheld those invariants, trust me". Providing a safe API to an unsafe function is a valid thing to do
Also if you mark a function as unsafe you don't need unsafe blocks in that function
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