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I'd like all new files created by Emacs (28.0.50 prerelease on Win10) to have Unix-style (LF) line endings by default. I've had the following in my .emacs for a long time:

(prefer-coding-system 'utf-8)
(set-charset-priority 'unicode)
(setq default-process-coding-system '(utf-8-unix . utf-8-unix))

While researching that, I did M-x describe-coding-system utf-8, and it says:

U -- utf-8 (alias: mule-utf-8 cp65001)

UTF-8 (no signature (BOM))
Type: utf-8 (UTF-8: Emacs internal multibyte form)
EOL type: Automatic selection from:
    [utf-8-unix utf-8-dos utf-8-mac]
This coding system encodes the following charsets:
  unicode

So what does "Automatic selection" mean? How does it automatically select? (For new buffers of course -- existing buffers, it figures it out as always.) I've been using this default coding system for years, but often when I create a new buffer, it's in DOS mode.

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