proxy_upstream_filter return value has opposite meaning

[allan2]

For request_filter , a return value of Ok(false) continues to the next phase.
For proxy_upstream_filter, Ok(true) continues to the next phase.

All of the other methods of ProxyHttp with a Result<bool> signature return Ok(false) by default.

Could proxy_upstream_filter also follow this pattern, returning Ok(false) to continue?