CCL: Neutrino masses error handling

Just running:

cosmo = ccl.Cosmology(Omega_c=0.27, Omega_b=0.045, h=0.67, 
                      sigma8=0.8, n_s=0.96, w0=-1., wa=-0.0,
                      m_nu=0.05)

gets into an infinite loop that you can only Ctrl+C out of. This will happen whenever you pass m_nu<0.06.

1. Why is this happening? It is a bit weird that m_nu=0 is fine, but the gap between 0 and 0.06 is not. In principle people should be able to put in whatever positive neutrino masses they want, even if they’re unphysical (and I’d like to understand what “unphysical” means exactly - maybe @c-d-leonard knows?).
2. In any case, it should not be possible to fall into that infinite loop. Looking at the code, I think it should be very easy to sort that out.