Scripts called by `alias` no longer accept arguments passed to them

This issue is probably caused by commit 51e1492e.

To replicate issue:

Save this script as ~/brightness.ion.

Add an alias line in ~/.config/ion/initrc calling the script: alias brightness = "ion ~/brightness.ion ".

Run the script by calling the alias and pass an argument to it: brightness 10.

Before updating ion to the build containing the commit mentioned above, this used to work and change the brightness to 10 (after asking for and receiving the correct password). Now, the script doesn't receive the argument and instead asks for input.