Expandable rx_buf?

[stevefan1999-personal]

What if I can supply a Vec<u8> and won't have to expand the buffer and retry the request again?

Example code in question: https://github.com/stevefan1999-personal/rust-igd/blob/e52d615a395e25b9134cea56e1d3225317d868ea/src/aio/mod.rs#L47-L70