See this, @Jici
This is a big issue actually. There does seem to be a simple fix and we should definitely push bubble to make it. It is likely not easy for bubble to just accept periods but they should definitely offer a substitution as a solution (like PHP does). Def not keen to have something in between bubble and whatapp - would be a huge drain of time and resources.
BTW, super-appreciative of your taking the time to understand and respond. Thanks!