Conversion of non-copyable Struct to tuple

I have the following use case that converts a non-copyable Struct to tuple:

```cpp
#include
#include

struct person {
person (person const&) = delete;

std::string name;
unsigned short age;
};

BOOST_HANA_ADAPT_STRUCT(person , name, age);

int main()
{
auto t = boost::hana::to_tuple(std::declval());
return 0;
}
```

that fails to compile with the following error:

```
boost/hana/detail/ebo.hpp:73:40: error: use of deleted function 'person::person(const person&)'
: data_(static_cast(t))
```

Since I did not see any restriction in the documentation regarding copyability, I wonder if this is expected and/or could be worked around?

Reproduce the example using boost/hana.hpp and inspect boost/hana/detail/ebo.hpp, especially the construction reached through boost::hana::to_tuple. Determine whether conversion of the adapted non-copyable person is intended to work, then define the expected behavior and verify it with a focused regression test or documentation update.

Written by the indexing model from the issue text.