Wrong process results in negative exponetials

[tianshuo]

-5^2
Drag the 2 without releasing, the answer gives NaN, but after releasing, the answer is a real number.

[osnr]

Another rounding issue.. scrubbing granularity too #15

The values between -5^2 and -5^3 are actually NaN, and you scrub between them, but it rounds off to one of the two when you let go.. hm. One of the things in that sentence should change