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Roblox setcallstack is one of those terms that usually starts popping up once you move past basic "Hello World" scripts and start poking around the more technical, under-the-hood aspects of the Luau engine. If you've spent any time in the deeper corners of the scripting community—especially where people talk about debugging, optimization, or how the engine handles its execution flow—you've likely heard it whispered about. It's not your average every-day function like Instance.new() or wait(). Instead, it sits in a much more specialized territory, dealing with how the virtual machine (VM) knows where it is and what it's supposed to be doing at any given moment. ...