It is possible for some sites to choose and arbitrary Aggregate Report size and
to truncate reports at that size. Google currently truncates at 1,000,000 
records.
The problem is that without knowing how many records are missing, we do not know
if we can trust the sent data. For example, if 1,000,000 record are reported
for example.com, and 20 were omitted, that is not statistically significant
enough to worry about, but is 100,000 were omitted the actually reported data
may be misleading and should probably not be used.
I suggest that the Aggregate Reports should contain an indication
of the data included and omitted. Perhaps:

        <records_available>1405671</records_available>
        <records_reported>1000000</records_reported>

Best Regards,
--Bryan Costales
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