Axis along which the interpolation goes in the original array
Additional trailing shape of the input arrays, excluding the interpolation axis.
Dtype of the y-data arrays. Can be set via _set_dtype, which forces it to be float or complex.
Deal with input data type and interpolation axis rolling. The actual interpolator can assume the y-data is of shape (n, r) where n is the number of x-points, and r the number of variables, and use self.dtype as the y-data type.
Common features in univariate interpolation
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