find() is pretty broken

[zpostfacto]

ujson::find() is simply a wrapper around std::lower_bound, so it will almost always claim to find the key you are looking for, unless you pass a name that is less than all other keys.

Sorry for not submitting an official pull request, but the fix is pretty obvious. You need to do something like this:

inline object::const_iterator find(object const &obj, char const *name) {
    assert(std::is_sorted(obj.begin(), obj.end()));
    object::const_iterator it = std::lower_bound(obj.begin(), obj.end(), name,
                            [](name_value_pair const &lhs, char const *rhs) {
        return lhs.first < rhs;
    });
	if ( it == obj.end() || it->first != name )
		return obj.end();
	return it;
}