1) Changed the template of 'from(const TV<TT,TL> & container)' function from int to unsigned. Only this way it accepts std::array properly for me.

2) Changed return types of some 'from()' functions to auto and used decltype() to generate the type of iterator, because there is no guarantee that iterator of collection A is A::const_iterator.

3) Added two more versions of 'from()' function, which accept std::set and std::map.

Plus: Untabyfied