The wide-count test announced map32 as 32770 pairs, which fits in 16 bits, so a
count read as its low 16 bits survived. map32 now announces 65537 pairs and
array32 65540 children; both low halves close the container early.
Builds: yes.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>