This is the callback invoked by Shiny at runtime when it creates a function, so Shiny and RStudio (and, for purposes of interoperability, any other debugger that might want to debug Shiny apps) needs to agree on the name, and the function needs to be on the search path. 

So my concern was that adding a "." would imply that this is never intended to be invoked from an external source, when in practice this is more like an API that Shiny uses. If that coupling seems inappropriate (or adding "." is appropriate in this context despite the way the function is used), let's chat further.