printf %s vs. %b in Dash vs. Bash

[jhansonxi]

Xubuntu 14.04 x86_64

Bash (4.3-7ubuntu1.5):

printf "%.s#\n" a
#
printf "%.b#\n" a
a#

Dash (0.5.7-4ubuntu1):

printf "%.s#\n" a
#
printf "%.b#\n" a
#

Esoteric but it was recommended that I report it as a bug under the assumption the design intent is for %b and %s to have the same behavior. Bug was confirmed in upstream development branch: http://www.reddit.com/r/bash/comments/2o8h6f/bug_printf_s_vs_b_in_dash_vs_bash/