Maybe adding lists isn't so hard ..?

[skx]

• Introduce an Object class
  • We'll have three objects, number, string, and list
    • list will hold Objects so it can contain strings, integers, or other lists.
• Update the environment package so the variables are now map[string] *Object

Annoyingly at that point we'll almost certainly need to change our function signatures for HostFunction to read:

function func(i *Interpreter, args []*Object) (Object, error)

Once that is done we'll have:

• The interpreter allowing different types.
• The built-in functions, such as list, returning those types.

The other complication will be that we'll need to validate types on our primitives, not just argument-counts.

e.g. exit will need to ensure it has "string|number". Similarly the return value of interpreter.Evaluate and interpreter.Eval will need to be *Object,error rather than string,error

So significant churn, but the actual steps are pretty simple.

[skx]

Tagged wontfix because I think the effort involved will be pretty substantial, even if logically the description above shows that it can be done in a series of discrete steps.

The biggest stumbling block will probably be collecting the arguments ahead of calling the function(s).