Add conversion between other integers type and `integer`. See [`is_bounded`](http://en.cppreference.com/w/cpp/types/numeric_limits/is_bounded), [`min`](http://en.cppreference.com/w/cpp/types/numeric_limits/min) and [`is_integer`](http://en.cppreference.com/w/cpp/types/numeric_limits/is_integer).
Add conversion between other integers type and
integer. Seeis_bounded,minandis_integer.