Hi! a brutal method would probably be to do a diff/comparison between grammars - via grammar-tree CLI command [*] - taken on various platforms (Aruba 8320, 8325, 8400X, 6400 and 6300)...with such method you would rapidly verify differences, if any...I use meld to see what changed among releases...having a document released by Aruba would be nice (with a detailed revision history).
Clearly I presume grammar-tree varies on each examined platform...if not, my method will only be useful to check differences within a particular Switch series and not among Switch series.
[*] Using, as example, a command like copy command-output "grammar-tree" tftp://<your-TFTP-Server-IP-address>/grammar-tree_Aruba_8320_TL.10.03.0031.txt vrf mgmt to extract via mgmt VRF the grammar-tree on our system.