See following example:
$ echo ${.sh.version}
Version jM 93u 2011-02-08
$ x=123
$ function x.unset { return; }
$ echo x=$x
x=123
$ unset -v x
$ echo x=$x
x=
$But according to the ksh manual, "If the unset discipline is defined for a variable, ... The variable will not be unset unless it is unset explicitly from within this discipline function."
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