Range damage bug?

[Aleks]

I usually play Lucky on Danger 5 with Slingshot as my starting weapon, and when my range damage becomes 1 (or any positive number) i don't do that amount of extra damage, i need 2 range damage to do a bonus of 1 damage. But if i my range damage becomes a -1 or -2, then i lose that amount of damage.

Is this a bug or a Danger 5 feature that isn't listed?

[VisionofFire]

Not a bug, working as designed.
Look more carefully at the weapon stats screen.
Slingshot has 80% ranged damage scaling, and fractions round down to the nearest whole number. Many weapons do not have 1:1 scaling, SMG, Shotgun, etc.

So 1 ranged damage = 0.8 => gets rounded down to 0.
Going negative puts you at -0.8, which rounds down to -1.