in src/trace/context/ContextCarrier.ts [90:100]
public static from(map: { [key: string]: string }): ContextCarrier | undefined {
if (!Object.prototype.hasOwnProperty.call(map, 'sw8')) return;
const carrier = new ContextCarrier();
carrier.items
.filter((item) => Object.prototype.hasOwnProperty.call(map, item.key))
.forEach((item) => (item.value = map[item.key]));
return carrier;
}