Ah. Simple, concise, and clear, thanks. That explains why I couldn't find anything with more generic searches on loading from classpath, though I'm surprised there wasn't a similar explanation.
I've got the basics set up reading from a config file, but I was reading files with groups of symbols in them. I was hoping to switch to reading a single symbol per file (to cut down on json indentation levels) as I switched to reading from assets. But if I'll need to maintain an index then I'll just keep using grouped files.