Request for additional overload of `operator|(result<T&>, U)`

[grisumbras]

Consider this: https://godbolt.org/z/qK4GTrdYM

The decay function is only needed there, because try_at returns result<value const&>, and the righthand operand of operator| is not convertible to value const&.

Given that operator| is used for providing a default, and the default usually doesn't exist before it is required, most of the time you don't want to return a result<T&>, even if the source is a result<T&>.

I can suggest adding result<T> operator|(result<T&>, U) overload that matches if U is convertible to std::decay_t<T&>. Same for function overloads.