Yes, kind-of. However, when using ISDECLARED to check whether a variable has been declared or not and then using this distinction to DIM a variable you end up having to use a GLOBAL due to scope issues.
code:
$gNull=SetOption("Explicit","ON")
If IsDeclared($foo)
   "Foo is a variable" ?
   dim $foo
Else
   "Foo is not a variable" ?
EndIf
"Foo is a "+vartypename($foo)
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