fs4 1.0.0

No libc, pure Rust cross-platform file locks. Original fs2, now supports async and replace libc by rustix.
Documentation 
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#[cfg(any(feature = "sync", feature = "fs-err2", feature = "fs-err3"))]
pub(crate) mod sync_impl;

cfg_async!(
  pub(crate) mod async_impl;
);