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sub populate {
    my @array = (...);
    return @array;
}

# Serializes an array, a hash or a list which contains only
# strings and undefs. Everything else will be stringified.
...
    my @array = (...);
    return serialize_string_list @array;
}

function do_populate_cb(s) {
    ... do something with s...
}

// Deserializes a list serialized with serialize_string_list.
function deserialize_string_list(s) {
...
       ... do something with array[i]...
    }
}