`PartialOrd` doesn't work with new type

I have the following trivial new type:

#[derive(Debug, Clone, Copy, Ord, PartialOrd, Eq, PartialEq, From, Into)]
pub struct CustomPosition(u32);

When trying to compare two values of this type, I'm getting an error:

  error: `i8` type used without `OpCapability Int8`
       |
  note: used from within `<u32 as core::cmp::PartialOrd>::partial_cmp`
      --> /home/nazar-pc/.rustup/toolchains/nightly-2025-06-23-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/cmp.rs:1989:5
       |
  1989 |     ord_impl! { char usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
       |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  note: called by `<ab_proof_of_space_gpu::shader::sort_buckets::CustomPosition as core::cmp::PartialOrd>::partial_cmp`
      --> crates/farmer/ab-proof-of-space-gpu/src/shader/sort_buckets.rs:17:35
       |
  17   | #[derive(Debug, Clone, Copy, Ord, PartialOrd, Eq, PartialEq, From, Into)]
       |                                   ^^^^^^^^^^
  note: called by `<ab_proof_of_space_gpu::shader::sort_buckets::CustomPosition as core::cmp::PartialOrd>::le`
      --> /home/nazar-pc/.rustup/toolchains/nightly-2025-06-23-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/cmp.rs:1403:14
       |
  1403 |         self.partial_cmp(other).is_some_and(Ordering::is_le)
       |              ^^^^^^^^^^^^^^^^^^
  note: called by `ab_proof_of_space_gpu::shader::sort_buckets::perform_compare_swap`
      --> crates/farmer/ab-proof-of-space-gpu/src/shader/sort_buckets.rs:80:32
       |
  80   |     let (smaller, larger) = if a <= b { (a, b) } else { (b, a) };
       |                                ^^^^^^

At the same time, comparison of u32 directly works fine and doesn't require Int8 capability.

While this is likely related to discussion in https://github.com/Rust-GPU/rust-gpu/issues/307, I think it is distinct enough to be reported separately.

Start with the reproduction in crates/farmer/ab-proof-of-space-gpu/src/shader/sort_buckets.rs, especially the CustomPosition derive at line 17 and comparison at line 80. Compare the generated PartialOrd path for CustomPosition with direct u32 comparison, then inspect the handling of the unwanted Int8 capability; done means new-type comparisons compile without requiring Int8.