In client::Builder::enable_push documentation:

pub fn enable_push(&mut self, enabled: bool) -> &mut Self;

This value is included in the initial SETTINGS handshake. When set [?!], the server MUST NOT send a push promise. Setting this value to value to false in the initial SETTINGS handshake guarantees that the remote server will never send a push promise.

Is it meant to be "when set to false"?