Static interface for types which can store their values as packed
elements in an array.  These methods and properties are expected to be
defined on a constructor function.
    
    Members
    The number of elements used to pack the object into an array.
Methods
    Stores the provided instance into the provided array.
    
| Name | Type | Default | Description | 
|---|---|---|---|
value | 
            
            * | The value to pack. | |
array | 
            
            Array.<Number> | The array to pack into. | |
startingIndex | 
            
            Number | 
                
                    0
                
                 | 
            
            optional The index into the array at which to start packing the elements. | 
    Retrieves an instance from a packed array.
    
| Name | Type | Default | Description | 
|---|---|---|---|
array | 
            
            Array.<Number> | The packed array. | |
startingIndex | 
            
            Number | 
                
                    0
                
                 | 
            
            optional The starting index of the element to be unpacked. | 
result | 
            
            Object | optional The object into which to store the result. | 
Returns:
    The modified result parameter or a new Object instance if one was not provided.
    
