Set Results Per Page For Google Node.js Youtube API v3 playlists.list() Method

I'm using the Google YouTube Api (v3) to fetch the video IDs for a YouTube Playlist. My code is working well enough, but I'd really like to set the "resultsPerPage" variable to a higher number. It is set to 5 by default. I'm using it for album tracks so most of the playlists that I'm working with are between 8 and 15 videos. It would be nice to get all of their info in one call.

When I execute the same request from the Google API Explorer there is no such limitation; it returns all of the videos in one response.

I tried setting the "resultsPerPage" option Node.js code that fetches the data, but that had no effect:

  const youtube_v3 = require('@googleapis/youtube').youtube_v3;  const youtube = new youtube_v3.Youtube();  const requestOptions = {    key: process.env.YOUTUBE_API_KEY,    part: 'snippet,contentDetails',    fields: 'items(snippet/title,contentDetails/videoId),pageInfo,nextPageToken',    playlistId: playlistId,    maxResult: maxResults,    resultsPerPage: 10 // this does nothing!  };  if ( pageToken ) {    requestOptions.pageToken = pageToken;  }  const results = await youtube.playlistItems.list( requestOptions );  const data = results.data;

I found some info in the Docs about a PageInfo class. It has a method named set_results_per_page() which seems promising. However, I have no idea how to access that class.

Has anyone managed to change the number of results per page using the API?