Bear in mind that Unreal and Unity both have some form of internal garbage collection systems that are compiled to asm.js. In the case of Unity, C# is transpile

Bear in mind that Unreal and Unity both have some form of internal garbage collection systems that are compiled to asm.js. In the case of Unity, C# is transpiled into asm.js code. You could write in potentially any GC language, it's just that the GC needs to be included.