Hi , currently, I'm doing:

0=${${(M)${0::=${(%):-%x}}:#/*}:-$PWD/$0}

on entry to each function or script. It works well, however, I'm planning
to update the plugin standard recommendation for $0 support and I'm
thinking if there are any circumstances where it might fail? $0 is to point
to the script/function source.

Also, I'm looking for a way to disable the promptsubst/print -P for a
single variable, something like `print -P ${(!%)var}`, where !% is to
denote that prompt expansion should not be done.

-- 
Best regards,
Sebastian Gniazdowski