There are 4 Variable data levels described by adjectives:

• Skeleton,
• Summary,
• DFG (previously Packed[Variable]),
• Compute (previously DFG[Variable])

As an example, getVariable:

• getVariableSkeleton -> VariableSkeleton
• getVariableSummary -> VariableSummary
• getVariableDFG -> VariableDFG (previously PackedVariable)
• getVariableCompute -> VariableCompute (previously DFGVariable)

getVariable returns type determined by dfg container (dispatch). May only support VariableDFG as default.

VariableDFG is favoured above just Variable.