I believe Vec is a straight array underneath, which is reallocated at a larger size when full. And Vector in the `im` crate you mentioned looks very interesting indeed.
Reminds me of _Journeys Into the Outside_ by Jarvis Cocker.
And that reminds me of the time when I saw him in passing in a corridor at King's Cross Thameslink and my hand was halfway up into a wave before I realised that he wouldn't know who am.
I've never seen square brackets used like that around a dot in an IPv4. Spent a while reading whether it was even valid to finds out it's not!
Apparently this is added by the writer/editor of the news article so that the malicious IP does not get hyperlinked so that nobody clicks it by accident.