as of dash 0.5.10, this script waits for the sleep to terminate before
executing the last line, which no other /bin/sh does.
dash worked fine.

sleep 3 &
echo first in main shell
( echo in subshell; )
echo back to main shell

Found by users of the Void Linux project:

Leah Neukirchen  <l...@vuxu.org>  http://leah.zone
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