[jcranmer]

A Zumwalt-class destroyer would have violated the treaty-era [1] restrictions for heavy cruiser, and is larger than many pre-deadnought battleships [2]. Size inflation is very real in naval terms; the size of modern naval craft is often much, much larger than their historical counterparts.

[1] 1920s and early 1930s, for those who don't know their naval history.

[2] HMS Dreadnought being launched in 1906 and essentially making all existing battleships obsolete on launch.