This is a false positive but either way is fine.

    warning: incorrect implementation of `partial_cmp` on an `Ord` type
      --> src/impls.rs:39:1
       |
    39 | /  impl PartialOrd for Prerelease {
    40 | |      fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> {
       | | ___________________________________________________________-
    41 | ||         Some(Ord::cmp(self, rhs))
    42 | ||     }
       | ||_____- help: change this to: `{ Some(self.cmp(rhs)) }`
    43 | |  }
       | |__^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incorrect_partial_ord_impl_on_ord_type
       = note: `-W clippy::incorrect-partial-ord-impl-on-ord-type` implied by `-W clippy::all`

    warning: incorrect implementation of `partial_cmp` on an `Ord` type
      --> src/impls.rs:45:1
       |
    45 | /  impl PartialOrd for BuildMetadata {
    46 | |      fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> {
       | | ___________________________________________________________-
    47 | ||         Some(Ord::cmp(self, rhs))
    48 | ||     }
       | ||_____- help: change this to: `{ Some(self.cmp(rhs)) }`
    49 | |  }
       | |__^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incorrect_partial_ord_impl_on_ord_type

rust-lang/rust#113941

Fixed in nightly-2023-07-23.

This reverts commit 2399480.

Adding missed unit test cases