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## Abstract This pull request implements [P3029R1](https://wg21.link/P3029R1). The paper discusses the current behavior of `mdspan`'s most common pointer-indices CTAD, where the `Extents` template parameter is deduced as `dextents` (dynamic extents), even when passing compile-time constant values. The author believes this behavior is suboptimal, as it doesn't take advantage of the compile-time information. The proposed change suggests deducing static extents if `integral_constant`-like constants are passed, resulting in more intuitive syntax and less error-prone code. ## Reference - [P3029R1](https://wg21.link/P3029R1) - [Draft C++ Standard: [span.syn]](https://eel.is/c++draft/span.syn) - [Draft C++ Standard: [mdspan.syn]](https://eel.is/c++draft/mdspan.syn)