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Support slices in OnceRef and OnceBox #246

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Support slices in OnceRef and OnceBox #246

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Commits on Aug 10, 2023

  1. Support slices in OnceRef and OnceBox 

    This is implemented through a new public-in-private `OncePointee` trait.
If this was instead done with `impl OnceRef<[T]>`, the compiler fails to
infer which methods we want to use.

Because of the usage of `core::ptr::slice_from_raw_parts` in `const`,
this change increases the MSRV to `1.64.0`.
    @nvzqz
    nvzqz committed Aug 10, 2023
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  2. Refactor OncePointee to not rely on slice layout 

    This allows for reducing the MSRV to `1.61.0`.
    @nvzqz
    nvzqz committed Aug 10, 2023
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