Just a note for anyone who uses #darktable for raw processing and wants to play with anamorphic lenses, online you'll find no results for how to desqueeze but there is actually a way to do it. Using the rotate and perspective module, change the lens type from "generic" to "specific" and you should be able to then adjust the aspect ratio to your lens' (eg, in my case, 1.33)
@darktable Wild, my google skills must be failing me. I got a bunch of results which basically were forum posts where someone would ask the question and receive the reply "this isn't supported just do it in <insert image editor>".
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