i think we understand that the code we write has to be compatible with PHP 7. we are asking about/talking about the framework itself, which yes is mostly contained in the system folder. having our codeigniter application be compatible with PHP 7 is not the issue. knowing that the framework is compatible means that every single library, helper, etc in the framework has been checked -- the codeigniter organization puts their stamp of approval on it -- and it becomes part of the framework description.
maybe for some larger context - every major framework is publicizing their compatibility with PHP 7. they are not saying php 5.3 +
in one month when PHP 7 is released there will be an avalanche of tutorials, announcements, books, videos, and fuzzy elephants. people will be searching for frameworks that state explicitly that they work with PHP 7. i want to see Codeigniter in on that because it seems like if Codeigniter is one of the fastest frameworks on php 5, its going to be supersonic with php 7 .
