declare is no longer creating array variables

[Øyvind 'bolt' Hvidsten]

Tested with shbot in #bash (freenode):
42# set -u; declare -a foo; echo ${#foo[@]}
0
43# set -u; declare -a foo; echo ${#foo[@]}
bash: foo: unbound variable
43# set -u; foo=(); echo ${#foo[@]}
0

Is this a bug?