processing executable files

Is there any specific reason why executable files have to be excluded from processing by guardian (https://github.com/f/guardian/blob/master/src/guardian/watcher.cr#L57)?

I have a repo with some very simple Crystal programs (tasks for AdventOfCode) that I've all marked executable (with the hashbang line `#!/usr/bin/env crystal run`) so that I can run them from the command line easily, and now I've installed guardian to see if it make things more convenient, but it took me a while to figure out why it didn't work at all when I told it to watch `./**/*.cr`...