  We test a model of inflation with a fast-rolling kinetic-dominated initial
condition against data from Planck using Markov chain Monte Carlo parameter
estimation. We test both an $m^2 \phi^2$ potential and the $R+R^2$ gravity
model and perform a full numerical calculation of both the scalar and tensor
primordial power spectra. We find a slight (though not significant) improvement
in fit for this model over the standard eternal slow-roll case.
