I looked at Get containing path of lua file, and I can see that:
print(debug.getinfo(1).source)
... results with e.g.:
@/Users/e/test.lua
Apparently, as a path, this is a string - but what is the "at sign"/"at character" @
there for; what does it mean?
It was otherwise quite difficult finding anything useful related to this, by doing an internet search for Lua "at sign"
(even with quotation marks)