How will identify Add() method behave when users are merged?

[ProdigyMaster]

Summary

Hey, I want to use method new amplitude.Identify().add('karma', 1), but I am not sure how it will work when users are merged?
Example: I have the same user before he logged in, so he doesn't have a user id yet. Karma is increased on both devices. What will happen when the user will be merged after logging on to both devices? What will be his karma value?

Device 2
karma - 1

Device 1
karma - 1
karma - 2

[kelvin-lu]

Hey @ProdigyMaster !

Since this is not totally in the purview of the SDK itself, we're going to talk to our internal infrastructure team to give clarification here - apologies for the delay!