Ok well thanks people! Thats why I came here. Much quicker and less painful then SO. I got like 4 people who knew the answer immediately. Without being marked as a duplicate 100 times.
@RohanJhunjhunwala The most important difference is proper sandboxing, which means I should be able to host pretty much any language on TIO. REPL/interactive may be introduced at some point, but I don't think it will happen soon.
@RohanJhunjhunwala I'm not really confident in the current sandboxing method, and I'd have to enable it individually for each interpreter since it's a bit quirky. Notably, for Python 3.5 which I wanted to add to TIO, the v1's sandbox just segfaults.
@LeakyNun your update didn't seem to reverse bork anything. I'll commit the fixed semicolon, but in order to verify the bitshift I'll have to do math which wont work out well for me at 11 pm my time.