Alchemy (Su) vs Alchemy (Ex)

[The Only Sheet]

The Alchemist has Alchemy (Su) while the new Investigator class (from the Revised Advanced Class Guide Playtest) has Alchemy (Ex)...

Would that really be intentional or would this fall in the 'mistake' bin?

http://TheOnlySheet.com

[Nefreet]

I'd file it in the "Playtest" bin.