When I used this command:

/scoreboard players test fakeplayer testscore -1 -100

It outputs a:

The number you have entered (-100) is too small, it must be at least -1

I expected it to work for negative numbers because of the the new .json signs, if you have a remove player sign and because the player is fake, you cannot target them in any other way to set their score to 0 (because for example on a join game sign there is a remove player sign, if you hit it too much it will go into negative numbers and there is no way to have a negative player!) other than by using test that does not work for numbers lower than -1.

What I was expecting when I used

/scoreboard players test fakeplayer testscore -1 -100

was something like

Score -3 is in range -1 to -100

If you could please fix this bug it would be awesome to all mapmakers who want to use this in books and signs like myself!

Thanks

~TheDestruc7i0n