What is `MaybeUsefulNode.errors_in_a_row` for in crates/dht/src/dht.rs ?

[moshen]

Looking at routing_table, it's used to check / mark a routing table node as bad.

Though there isn't a similar check for MaybeUsefulNode:

rg 'errors_in_a_row' crates/dht/src/dht.rs                                                                                                                                                                                            
76:    errors_in_a_row: usize,
494:                n.errors_in_a_row += 1;
506:                node.errors_in_a_row = 0;
548:            errors_in_a_row: 0,

Is it supposed to be checked in the closest_nodes?