Starting with OpenEdge Release 10.1B, ABL includes a 64-bit integer data type, INT64. This data type is separate from the existing 32-bit data type (INTEGER). The INT64 data type is compatible with all current functions and statements that currently support the 32-bit integer. That is, INT64 and INTEGER are interchangeable everywhere in ABL, except in parameters and return types for strongly-typed class-based methods where you want the type checking and where you control both the caller and callee routines.