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165 base.exportTo("tracing.trace_model",function(){function d(b,a,c){this.createObjectInstanceFunction_=b;this.parent=a;this.id=c;this.instances=[]}d.prototype={idWasCreated:function(b,a,c){if(0==this.instances.length)return this.instances.push(this.createObjectInstanceFunction_(this.parent,this.id,b,a,c)),this.instances[0].creationTsWasExplicit=!0,this.instances[0];var e=this.instances[this.instances.length-1];if(c<e.deletionTs)throw Error("Mutation of the TimeToObjectInstanceMap must be done in ascending timestamp order.");