code: function registerValueHandler (handlers, type, handler) {
    let typeofType = typeof type;
  
    if (typeofType !== 'function' && typeofType !== 'string') {
      throw new Error("type must be a class constructor or string");
    }
  
    if (typeof handler !== 'function') {
      throw new Error("handler must be a function");
    }
  
    for (let typeHandler of handlers) {
      if (typeHandler.type === type) {
        typeHandler.handler = handler;
  
        return;
      }
    }
  
    handlers.push({
      type: type,
      handler: handler,
    });
  }
docs: Register a value type handler
  
  Note: this will override any existing handler registered for this value type.