Let's set up a 2-line file:
hello
world
and have fun with the q command. You need to restart Vim before every example.
q"~q
:di reveals ~ has been written to "" and "0, which isn't that unusual.
ddq"~q
"" still matches "1, and q" only wrote to "0. That's odd.
ddq1~q
This wrote to "" and "1, but "0 is untouched.
The "" register behaves differently depending on whether you use delete/yank, :redir, :let, or q. (Am I missing any?) I don't know the internals, but I think of it as a pointer to the register the text is actually in. It has a special affinity for "0.
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