String windings behind the nut. A standard string wouldn't taper before it reached the tuner for the B and E. The A, D, and G tuners are far enough from the nut that they can be standard length. The C (and higher) strings naturally lack a taper.
Same on my 33" basses, at least for the B string, the E just fits.
One way round is to have the B string go through the body, tends to nip off at least an inch in over all length...
Eude

