This interface is used to index a collection using the VO Array syntax.
The interface is implemented by the ARRAY type in the runtime, but you can also use it for your custom types.
XSharp.RT (in XSharp.RT.dll) Version: 2.6
public interface IIndexer
The indexer in this type is ZERO based, however in your PRG code you can use ONE based array indices.
When the compiler detects an index operation to a class that implements this interface then the compiler will automatically
adjust the indices (by subtracting one) unless the /az compiler option is enabled.