Scaled `Lanczos` interpolator throws `MethodError` regarding the `lbound()` function

[gruberchr]

If I create a ScaledInterpolation with the Lanczos interpolator as follows

using Interpolations

x = 0:0.1:1.0
A = randn(length(x))
itp = scale(interpolate(A, Lanczos()), x)

and try to interpolate, e.g. itp(0.33), a MethodError is thrown in the checkbounds() function. This error does not occur for the plain (unscaled) Lanczos interpolator.

It seems that an implementation of the function lbound() is missing for the scaled Lanczos interpolator.

[mkitti]

I will look into this. Thank you for the report.