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These annotations fall into a few categories * Some simply aren't needed since functions will always be in the same CGU anyway and are already candidates for inlining. * Many are on massive functions which shouldn't be inlined across crates due to code size concerns. * Others aren't necessary since calls to this crate are rarely inlined anyway (since it's lowered through LLVM). If this crate is called directly and inlining is needed then LTO can always be turned on, otherwise this will benefit downstream consumers by avoiding re-codegen'ing so many functions.