I thought an "interesting" part of the change was actually how they made a 50% chance work for the extra read. They select across a closed channel twice -- and it results in a mostly even distribution of chance.

    for i := 0; i < 100000; i++ {
        select {
        case <-closedChan:
            a++
        case <-closedChan:
            b++
        case <-closedChan:
            c++
        case <-closedChan:
            d++
        }
    }

Results in an almost even distribution across the select choices!

https://play.golang.org/p/cnAXBEZJm2B

(fixed playground link)