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Data model
Technically, all data in a Julia survey is stored as objects. But Julia is not an object-oriented language and does not currently supports features which allow for method creation or even method calls. This also means that currently all objects in Julia are immutable since you can do no modification of the objects in the current implementation. Note that immutability does not mean you cannot change what identifiers / variables point to, but you cannot directly modify the actual object.
Numbers are provided in both integer and decimal forms. These are created via integer and decimal literals. Numbers are immutable and do not change value once created. Integers have no inherent maximum value, but are constrained by system memory. Decimal objects are not floating point numbers, instead a representation is used which mimics expected results from "human math." The expected behavior for the precision of decimals (number of digits to show) are not specified at the moment.
Finite ordered sets are supported in Julia. Currently two different ordered set types are provided
A string is an ordered sequence of characters (ASCII is guaranteed to work, Unicode may work).
A list or array is an ordered sequence of objects. All objects in a list do not have to be of the same type. Julia currently supports lists made up of numbers, string, and/or other lists.
Callable types are types which support the creation of questions and choice experiments. In the future, Julia may support calls for user-defined functions, classes, and methods.