Changes from 5.3.1 to 5.4
The 'exec' and 'command' precommand modifiers, and options to them, are now parsed after parameter expansion. Previously, both the modifier and any options to it were parsed between alias expansion and parameter expansion (see zshexpn(1)), so they could neither be quoted nor be the result of parameter expansion. Examples: 's=command; $s -V ls' and '\command -V ls' now work as expected.
Functions executed by ZLE widgets no longer have their standard input closed, but redirected from /dev/null instead. That still guards against user defined widgets inadvertently reading from the tty device.
There is an option WARN_NESTED_VAR, a companion to the existing WARN_CREATE_GLOBAL that causes a warning if a function updates a variable from an enclosing scope without using typeset -g. It can be turned on for an individual function with "functions -W".
zmodload now has an option -s to be silent on a failure to find a module but still print other errors.
Signed-off-by: Pierre-Yves <pyu@riseup.net>