src/vs/platform/undoRedo/common/undoRedoService.ts/ResourceStackElement/toString
class ResourceStackElement:	public toString(): string {
		return `[id:${this.id}] [group:${this.groupId}] [${this.isValid ? '  VALID' : 'INVALID'}] ${this.actual.constructor.name} - ${this.actual}`;
	}