template <class Expr>
consteval bool is_consteval(Expr)
    { return requires { typename std::bool_constant<(Expr{}(), false)>; }; }

Hello author, I am learning about your project. I noticed that your function is used to determine whether Expr can be called. It uses typename to determine whether the template generated by std::bool_constant is a type for calling. So I think if this function is changed to the following, it should also meet your needs.

template <class Expr>
consteval bool is_consteval(Expr)
    { return requires { Expr{}(); }; }

What are your considerations for adopting the current method? Is it to facilitate further expansion of the code in the future?
Looking forward to your reply