Input framework: table name truncated at underscore

When loading a table in the input framework, e.g.:

Input::add_table([ $source="/tmp/sdb_servers",
$name="sdb_servers",
$idx=sdb_servers_idx,
$val=sdb_servers_val,
$destination=sdb_servers,
$mode=Input::REREAD
]);

And later on reporting when the input has been fully read:

event Input::end_of_data(name: string, source: string)
{
Reporter::info(fmt("Input stream name %s source %s ready", name, source));
}

This is what ends up in the reporter log:

0.000000 Reporter::INFO Input stream name sdb source /tmp/sdb_servers ready <script location redacted>, line 101

So it is truncating the input stream name before the underscore.