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Removed the "once_cell" dependency and replaced it with #![feature(once_cell_try)]
Removed the "memoffset" dependency and replaced it with #![feature(offset_of)]
#[stable(feature = "once_cell", since = "1.70.0")]
#[unstable(feature = "offset_of", issue = "106655")]
rust-lang/rust#106655
Did a simple test
1.71.0-nightly
once_cell = "1.8.0"
Debug
std::sync::OnceLock time: 1.8730884s
once_cell::sync::OnceCell time: 4.1763288s
Release
std::sync::OnceLock time: 47.0772ms
once_cell::sync::OnceCell time: 47.0337ms