**Blender Version**
Broken: 64124ba
**Short description of error**
Warp modifier seems to be clamping all values below 0, even if the custom curve is drawn in negative space. This quite limits the usefulness of the custom curve.
It's also clamping all values that go above 1 which makes strength's higher than 1 rather pointless too!
**Exact steps for others to reproduce the error**
{F140352}