lookupCompoundScoped is used by dictionary via stringOps to provide fast access
to compound tokens without the need to construct the container for every access,
e.g.
listU List<vector> ((1.1 2.1 1.1) (2.1 3.2 4.1) (4.3 5.3 0));
magU1 #calc "mag($listU[1])";
magU2 #calc "mag($listU[2])";
where the listU is declared as a List<vector> compound token which is then
accessed directly by $listU without the need to specify the type and the data is
accessed directly by reference which is more efficient, particularly if the list
is large.
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