add `read_at_least` function?

[cssivision]

read_at_least is similar to read_exact but read at least min bytes. reads from reader into buf until it has read at least min bytes. It returns the number of bytes copied success , when n >= min.

[alexcrichton]

Currently the functions here match the standard library's Read trait, but this doesn't exist on the Read trait?

[cssivision]

yes, it's a helper function. this function is convenient in some situation.

[alexcrichton]

My question would basically be why it's justified to go into tokio-io when it was decided to not place it into the standard library. IIRC there was a lot of discussion about this on rust-lang/rfcs#980

[cssivision]

thanks @alexcrichton, it spent me some time reading the whole discussion which inspired me a lot.

[carllerche]

It seems like the take away is "do nothing". As such, I will close this issue. Please let me know if this is not correct.