Filename for Negative Frame AURs

Right now if I set up an aur to save at “/home/joelaff/mysim_####.aur” it renders netagive and positive frame names like this:
mysim_-002.aur
mysim_-001.aur
mysim_0000.aur
mysim_0001.aur
mysim_0002.aur

Note how the negative filenames only have three digits instead of four. This makes the files sort incorrectly in most listings, which makes it difficult when you need to surgically delete certain AUR files.

Any chance we could get this updated so that the negative frames are named mysim_-0001.aur with four digits as selected by the #### syntax?

Thanks.