- CHANGES IN R 3.5.0:
  SIGNIFICANT USER-VISIBLE CHANGES:
    * All packages are by default byte-compiled on installation.  This
      makes the installed packages larger (usually marginally so) and
      may affect the format of messages and tracebacks (which often
      exclude .Call and similar).
  NEW FEATURES:
    * factor() now uses order() to sort its levels, rather than
      sort.list().  This allows factor() to support custom vector-like
      objects if methods for the appropriate generics are defined.  It
      has the side effect of making factor() succeed on empty or
      length-one non-atomic vector(-like) types (e.g., "list"), where
      it failed before.
    * diag() gets an optional names argument: this may require updates
      to packages defining S4 methods for it.
    * chooseCRANmirror() and chooseBioCmirror() no longer have a
      useHTTPS argument, not needed now all R builds support https://
      downloads.
    * New summary() method for warnings() with a (somewhat
      experimental) print() method.
    * (methods package.) .self is now automatically registered as a
      global variable when registering a reference class method.
    * tempdir(check = TRUE) recreates the tempdir() directory if it is
      no longer valid (e.g. because some other process has cleaned up
      the /tmp directory).
    * New askYesNo() function and "askYesNo" option to ask the user
      binary response questions in a customizable but consistent way.
      (Suggestion of PR#17242.)
    * New low level utilities ...elt(n) and ...length() for working
      with ... parts inside a function.

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