{"ScriptPreparationCode":"var native = [];\r\nfor (var i=0; i \u003C 1000000; i\u002B\u002B) {\r\n native.push(i);\r\n}\r\nvar imm = Immutable.List(native);","TestCases":[{"Name":"native copy","Code":"var b = native.slice().push(\u0027again\u0027);","IsDeferred":false},{"Name":"immutable copy","Code":"var b = imm.push(\u0027again\u0027);","IsDeferred":false}]}