Yea, EE3 is still in very early developement and it will change. Interesting text can be found at its github page:
https://github.com/Cakejoke/Equivalent-Exchange-3/blob/98534317a0103a59e10c4901d7eb9db78f2a7e50/ee3_common/ee3/common/emc/EMCType.java
it looks like pahimar is planning to have...