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Description

Convert slices from CRTP to C++20 concepts

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It seems that some conversions are still missing. This PR needs a little more work before it can be reviewed and merged.

Replace xtl::is_integral<T>::value trait with xtl::integral_concept
for consistency with existing C++20 concepts.

Add braces to if constexpr blocks for consistency.

…pressions

style: apply clang-format to slice concepts

a8c55a1

…uses

…epts