You've this mistake before, right? cat /tmp/foo.txt | vim
when you meant to do cat /tmp/foo.txt | vim - Somewhere early in my Vim learning I figured out the latter, so I usually don't repeat the mistake. But why *is* that even a mistake? What is the purpose/origin/history of the first example, the vim "sans-dash" behavior? Seems like the "vim -" behavior (read text from stdin) would make for a much more useful default.
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