src/vs/workbench/contrib/markers/browser/markersModel.ts/Marker/toString
class Marker:	toString(): string {
		return JSON.stringify({
			...this.marker,
			resource: this.marker.resource.path,
			relatedInformation: this.relatedInformation.length ? this.relatedInformation.map(r => ({ ...r.raw, resource: r.raw.resource.path })) : undefined
		}, null, '\t');
	}