Gets or sets the items at the specified index. In C# this
property is the indexer for the class.
The Item property is used to access items within the Array.
The ArrayAtom is accessed and used to create a value of type
If the type indicated is string then a null string will be
interpreted as an empty string.
If the type indicated is a double? then a null value will be
interpreted as a NullAtom.
All other types are non-nullable.