I reviewed the PR #1213 and it looks like we recently merged #1538 which prefered the non-square-brackets representation. However, this has not been released yet. So we could adjust it.

Based on the defintion of URI#host, I think we should probably prefer the square brackets representation... but I'm not sure what is canonical. I need to do some research.

Originally posted by @ioquatix in #1213 (comment)