In AOLserver 3.x, you can create an empty nsv with no
keys (e.g. with
"nsv_array set mynsvname [list]"), and the nsv would
exist. This also
matches the behavior of Tcl Arrays, which is good.
However in AOLserver 4 (I tested beta2 and beta4), it
seems that it is
impossible to create an empty nsv, and when you delete
the last key in
an nsv, the nsv itself is also deleted. This is BAD!
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