Confusing error message for relative coordinates with too high numbers

Can confirm for 17w06a.

Can confirm for 17w14a.

What happens: when you try to do a relative teleport the sum of your current position and the relative coordinate you entered is calculated and if it is >30000000 it will throw the error (with the sum of the coordinates because it is higher than 30000000).

An example:
I tp myself to 0 100 -1 (will be 0.5 100 -0.5 in the game) and then I relative tp myself to ~ ~ ~30000000 nothing is wrong, but when I relative tp to ~ ~ ~30000000 from 0 100 1 (will be 0.5 100 1.5 in the game) I get the error message because 30000000+1>30000000.