Base type for all runtime type descriptors. Sigma uses type descriptors to
represent structure of the data values. Data values of registers and context
variables come equipped with type descriptors in order to check the actual type
is the same as the type expected by the script.
Base type for all runtime type descriptors. Sigma uses type descriptors to represent structure of the data values. Data values of registers and context variables come equipped with type descriptors in order to check the actual type is the same as the type expected by the script.
getReg, getVar