mozilla-services/android-sync — comment on commit 91987cdd058fcf3752869871022f712e19a0490b
File: src/main/java/org/mozilla/gecko/sync/repositories/android/ClientsDatabaseContentProvider.java line 40
By rnewman:

Comment is incorrect in two ways.

1. It won't be inserted; it will be inserted or the existing row with that GUID will be updated.
2. This method returns true if the record is “new”, not if the insertion succeeded.