@@can.setValue( value )

The @@can.setValue symbol points to a function that sets the current value on the context object. "Value" may mean different things in different contexts; e.g. setting a can-compute's value updates the value stored internally to the compute, while setting an observable object's value will update all of the same-keyed properties of the object argument.

var internalValue = undefined
export var foo = function(val) {
    if(val) {
        internalValue = val;
    } else {
        return internalValue;
    }
};

// Get the internal value as the representative value
foo[canSymbol.for('can.setValue')] = function(value) {
    internalValue = value;
}