## Changes Introduced in V9.1.3

The following describes the most significant changes which occurred in the AST library between versions V9.1.2 and V9.1.3:

1. The KeyMapKeyMap class has a new method called astMapCopyEntryastMapCopyEntry that can be used to copy a single entry from one KeyMap to another.

2. The astSimplifyastSimplify method now prefers ShiftMaps over equivalent WinMaps.

3. The astSimplify method will now merge WinMaps with neighbouring diagonal MatrixMaps.