If you try to create smooth sandstone (ID 24:2) you can only shift-click 4 sets to your inventory.
e.g:

expected:
if you have four stacks of sandstone on the crafting table with a shift-click the crafting table should be empty and you should have 4 stacks of smooth sandstone in your inventory.

what happens instead:
you still have 4 stacks with 60 each on the table and 16 smooth sandstone in your inventory.

tested on V0.9.0.1 on CB 1.4.2R0.2

I was incorrectly checking the result slot for stack size as well as the crafting slots. The latest commit fixes this issue.