Negative locations show as the negative location +1

When teleporting to a positive location (/tp 5 4 5) you are told you have been teleported to 5.5, 4, 5.5
When teleporting to a negative location (/tp -5 4 5) you are told you have been teleported to -4.5, 4, 5.5

I can confirm this is the same on singleplayer and on servers.
This currently affects my (modified)server as the wrong location being reported causes invisible borders to be out of place.