Persistent Fuzzing API LibFuzzer

[zi0Black]

I'm developing a fuzzer that would strongly benefit from persistent fuzzing, since it requires many configuration steps, and doing them once per fuzzing instance can accelerate the process, but I see no macro to interact with LLVMFuzzerInitialize.
http://www.wilfred.me.uk/llvm/LibFuzzer.html#startup-initialization

https://github.com/rust-fuzz/libfuzzer/blob/c8275d1517933765b56a6de61a371bb1cc4268cb/src/lib.rs#L81C1-L98C2, I also noticed that the issue mentioned here in the comments has been resolved.

[fitzgen]

Is there a reason you cannot use std::sync::OnceLock to do the one-time initialization?