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pt-query-digest $event->{bytes} >= 1_048_576 why "_" in there?

FanFan ContributorCurrent User Role Patron
in the doc
Query is 1 MB or larger
$event->{bytes} >= 1_048_576
why not $event->{bytes} >= 1048576? what is '_' mean?

Is 1M the size of sql text? what is the calculation method?
select length("select * from xx where id=1") ?

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