<(...), >(...) and fds above 9

[Stephane Chazelas <stephane.chazelas@xxxxxxxxx>]

/tmp$ zsh -c 'exec {fd}< a; zmodload zsh/system; sysopen -u fd2 /dev/fd/$fd; echo $fd $fd2; exec 7< a; ls -l /proc/self/fd; cat <(ls -l /proc/self/fd)'
12 13
total 0
lrwx------ 1 stephane stephane 64 Jul  1 10:52 0 -> /dev/pts/15
lrwx------ 1 stephane stephane 64 Jul  1 10:52 1 -> /dev/pts/15
lr-x------ 1 stephane stephane 64 Jul  1 10:52 12 -> /tmp/a
lr-x------ 1 stephane stephane 64 Jul  1 10:52 13 -> /tmp/a
lrwx------ 1 stephane stephane 64 Jul  1 10:52 2 -> /dev/pts/15
lr-x------ 1 stephane stephane 64 Jul  1 10:52 3 -> /proc/464/fd
lr-x------ 1 stephane stephane 64 Jul  1 10:52 7 -> /tmp/a
total 0
lrwx------ 1 stephane stephane 64 Jul  1 10:52 0 -> /dev/null
l-wx------ 1 stephane stephane 64 Jul  1 10:52 1 -> pipe:[2044936]
lrwx------ 1 stephane stephane 64 Jul  1 10:52 2 -> /dev/pts/15
lr-x------ 1 stephane stephane 64 Jul  1 10:52 3 -> /proc/465/fd
lr-x------ 1 stephane stephane 64 Jul  1 10:52 7 -> /tmp/a

It seems fds above 9 are closed in those forms of process substitutions. 

It doesn't happen for the =(...) form of process substitution.

Is that intentional?

-- 
Stephane