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These have identical public fields; the only difference is that AccountInfo.Loader was using the transient _id field store the ID before filling in values. We can instead reuse the Integer _accountId field for this purpose. This may incur an additional boxing or so per account per request, but that cost should be negligible given how many allocations we do per request already. AccountInfoMapper is no longer required, so remove that entirely. We are now enforcing that AccountInfos passed to the loader have an _accountId. Since by default the old account.AccountInfo worked without an _accountId, add this as a separate FillOption and clear it if that option is not set. To verify this, check the owner fields in ChangeIT#get. Change-Id: Ied01750485cc728e91e585a31f3db8863bae7e40