changed garbage collection of file handles a bit. although it was working, in hindsight i'm really not quite sure *how*, or rather: Lua seems to be smarter than I already gave it credit for. it apparently realized that a new reference to the object to be gc'ed was created in its finalizer, so it let it live. however, i'm not quite sure why that didn't lead to a pseudo-infinite loop. now we just keep the stream as an upvalue for the timer callback that actually closes the stream; also, removed the checks if event.timer exists. if people remove that it's really their own problem

assets/opencomputers/lua/rom/lib/io.lua

@@ -267,11 +267,10 @@ function file.new(mode, stream, nogc)
     metatable.__gc = function(self)
       -- file.close does a syscall, which yields, and that's not possible in
       -- the __gc metamethod. So we start a timer to do the yield/cleanup.
-      if type(event) == "table" and type(event.timer) == "function" then
-        event.timer(0, function()
-          self:close()
-        end)
-      end
+      local stream = self.stream -- only keep the stream as an upvalue
+      event.timer(0, function()
+        stream:close()
+      end)
     end
   end
   return setmetatable(result, metatable)