'Construct a spline without making checks.
Accepts same parameters as the regular constructor. Input arrays
`t` and `c` must of correct shape and dtype.'

@classmethod
def construct_fast(cls, t, c, k, extrapolate=True, axis=0):

    self = object.__new__(cls)
    (self.t, self.c, self.k) = (t, c, k)
    self.extrapolate = extrapolate
    self.axis = axis
    return self
