PopulateMergeMatch does not work as expected

[nebucaz]

I expected to be able to update/merge existing records using PopulateMergeMatch as described in the documentation based. I've written a simple example like follows:

_config/config.yml

Member:
  test:
    Email: "[email protected]"
    Password: "password"
    PopulateMergeMatch:
      - Email

I expected the Populate task to merge with the existing record on consecutive runs of the populate task but it throws a validation error:

ERROR [User Error]: Uncaught ValidationException: Can't overwrite existing member #1 with identical identifier (Email = [email protected]))
IN GET /dev/tasks/PopulateTask
Line 852 in framework/security/Member.php

I've posted the sample-project here https://github.com/nebucaz/sspopulate

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