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ncarray::IndexArg

template<typename IdxT>
concept= hd_std::integral<hd_std::decay_t<IdxT>> ||
hd_std::same_as<hd_std::decay_t<IdxT>, Slice> ||
hd_std::same_as<hd_std::decay_t<IdxT>, Ellipsis>;

Determines whether an object as an allowable argument to array indexing functions.