The handbook tells us bash would be fine which seems to only apply to bashlayout-1 according to some voices in #gentoo-dev They should all be posix compliant now. The handbook does not make it clear that bash syntax is not allowed at all anymore.
s/bashlayout-1/baselayout-1/
Thanks, committed to CVS.
(In reply to comment #0) mmm, no, POSIX is *not* required. it's highly encouraged. if maintainers really need bash, we don't ban it.