Unable to use Base.OneTo for nearest neighbor interpolation NoInterp() with negative axis values

Try the following example:

x = Array(-3:1:3)
v = Array(-3:1:3)
itp = interpolate((x,), v, NoInterp())

It prompts:
for NoInterp knot vector should be Base.OneTo(7), got [-3, -2, -1, 0, 1, 2, 3]