[ast-users] [ksh93] Var still exists after unset?

[Clark J. Wang]

For example:

$ echo ${.sh.version}
Version jM 93u 2011-02-08
$ [[ -v vfloat ]] && echo yes || echo no
no
$ float vfloat
$ [[ -v vfloat ]] && echo yes || echo no
yes
$ unset vfloat
$ [[ -v vfloat ]] && echo yes || echo no
yes    <== It still exists after unset. ???
$

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