Bertram25/manaserv — comment on commit 2618d38a5d67cd57542977345070e938fe972829
File: src/game-server/attributemanager.h line 63
By Bertram25:

Maybe more attributeModType since this is setting up how AFAIK the attribute modifier are computed from the base one.
Example:

stacktype: stackable or absolute: Whether the attribute modifier can added to other similar ones, or only the last modifier set is taken in account.
modtype: additive, multiplicative: Whether it is added or multiplied to the base attribute to get the final value.