[Rd] discussion of change in R 3.3.0 to [<-

[Richard Morey]

In the NEWS for R 3.3.0 is this change:


    * [<- with an S4 value into a list currently embeds the S4 object
      into its own list such that the end result is roughly equivalent
      to using [[<-.  That behavior is deprecated.  In the future, the
      S4 value will be coerced to a list with as.list().

I cannot find a discussion of this change anywhere. Can someone point
me to a discussion of the reasons and/or implications?

Best,
Richard