unpack - convert a packed array to a generic array or list
arr.unpack()
The unpack() method converts a packed array
(such as PackInt, PackFloat,
etc.) into a generic List or
Array (an array of OadlVar)
with the same shape and dimensions.
If the array is already a generic list, it is returned unchanged.
A generic Array or List
containing the same elements as arr.
ArgCheck if any arguments are provided.
TypeCheck if arr is not an array.
a = [1,2,3]
a[1] = "hello"
Illegal type
b = a.unpack()
b[1] = "hello"
b
1 hello 3