18.15.0

new URL(HTTP://AMAZON.COM).href gives http://amazon.com/

18.16.0
new URL(HTTP://AMAZON.COM).href gives http://amaZon.com/

It seems the capital letter Z is not lower cased. Is that expected or is it a regression ?