If both slash and non-trailing-slash versions contain the same content and each returns 200, you can:
Consider changing this behavior (more info below) to reduce duplicate content and improve crawl efficiency.
Leave it as-is. Many sites have duplicate content. Our indexing process often handles this case for webmasters and users. While it’s not totally optimal behavior, it’s perfectly legitimate and a-okay.

Rest assured that for your root URL specifically,
http://example.com is equivalent to
http://example.com/ and can’t be redirected even if you’re Chuck Norris.