Consider, however, the style commonly used on chats such as IRC

This sort of writing generally leaves off periods on the ends of sentences

sometimes, it even leaves off the capitalization at the beginning, as well

and yet it manages to be entirely readable and generally unambiguous

This is remarkably similar to js's automatic semicolon insertion:

if the sentence makes more sense with a period at the end of the line

then the reader usually inserts one automatically, without thinking about it