code/controllers/subsystem/overlays.dm 
| /proc/overlays2text | Converts an overlay list into text for debug printing Of note: overlays aren't actually mutable appearances, they're just appearances Don't have access to that type tho, so this is the best you're gonna get |
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| /proc/realize_appearance_queue | Takes a list of appearnces, makes them mutable so they can be properly vv'd and inspected |
| /proc/diff_appearances | Takes two appearances as args, prints out, logs, and returns a text representation of their differences Including suboverlays |