- CHANGES IN R 4.0.4:
  NEW FEATURES:
    * File share/texmf/tex/latex/jss.cls has been updated to work with
      LaTeX versions since Oct 2020.
    * Unicode character width tables (as used by nchar(, type = "w"))
      have been updated to Unicode 12.1 by Brodie Gaslam (PR#17781),
      including many emoji.
    * The internal table for iswprint (used on Windows, macOS and AIX)
      has been updated to include many recent Unicode characters.
  INSTALLATION on a UNIX-ALIKE:
    * If an external BLAS is specified by --with-blas=foo or _via_
      environment variable BLAS_LIBS is not found, this is now a
      configuration error.  The previous behaviour was not clear from
      the documentation: it was to continue the search as if
      --with-blas=yes was specified.
  BUG FIXES:
    * all.equal(x,y) now "sees" the two different NAs in factors,
      thanks to Bill Dunlap and others in PR#17897.
    * (~ NULL)[1] and similar formula subsetting now works, thanks to a
      report and patch by Henrik Bengtsson in PR#17935.  Additionally,
      subsetting leaving an empty formula now works too, thanks to
      suggestions by Suharto Anggono.
    * .traceback(n) keeps source references again, as before R 4.0.0,
       fixing a regression; introduced by the PR#17580, reported
       including two patch proposals by Brodie Gaslam.
    * unlist(plst, recursive=FALSE) no longer drops content for
      pairlists with list components, thanks to the report and patch by
      Suharto Anggono in PR#17950.
    * iconvlist() now also works on MUSL based (Linux) systems, from a
      report and patch suggestion by Wesley Chan in PR#17970.

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