How to obtain constructor argsuments?

[CodeSandwich]

I have an internal transaction which deploys a contract. How can I obtain the constructor arguments that were used? In my setup even getting the full creation code would be enough, I have access to the raw creation code, so I can trim it off to get the arguments.

I was looking at cast run, but it doesn't show the creation code, it only says new <unknown>@0x.... I tried ----decode-internal and --decdoe-internal, both with and without --verbose, and none of them cause the creation code to be shown.