src/vs/workbench/contrib/tasks/common/taskConfiguration.ts/UUIDMap/constructor
class UUIDMap:	constructor(other?: UUIDMap) {
		this.current = Object.create(null);
		if (other) {
			for (let key of Object.keys(other.current)) {
				let value = other.current[key];
				if (Array.isArray(value)) {
					this.current[key] = value.slice();
				} else {
					this.current[key] = value;
				}
			}
		}
	}