isPrestamp(c, properties, container) {
    const stampApplies = this.#prestampMap.get(container);
    if (stampApplies) {
      return stampApplies[0] === c && stampApplies[1](properties);
    }
    return false;
  }
Check if a container was registered as a prestamp for this component with given properties
@param c Component
@param properties Properties that apply to the component
@param container Container to test for prestamp
@returns Is registered as a valid prestamp