RFE: Enable Shell Hotkey: ctrl+u

[Todd E Thomas <todd.dsm@gmail.com>]

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I'm emailing about some hotkey/shortcuts. From section 8.3.1 Readline Init
File Syntax <https://www.gnu.org/software/bash/manual/bash.html>:

   1. *Ctrl + U* Deletes before the cursor until the start of the command
      1. *Control-u: universal-argument Meta-Rubout: backward-kill-word*
      2. *Ctrl + K* Deletes after the cursor until the end of the command

*Ctrl + K* seems to be implemented in zsh but *Ctrl + U* seems to be a bit
flaky. It should behave as listed above but, what it's actually doing is
killing all words in the line.

I see how it's described in 4.2.2: Deleting
<https://zsh.sourceforge.io/Guide/zshguide04.html> but that's pretty terse;
not sure what to do with that.

*Request for Enhancement*
Please implement the *Control-u* functionality as described above. Or,
given the functionality exists, simply bind to *ctrl+u* by default.

I hear this as an occasional complaint from a few of us old geezers (like
me) who have a lot of muscle memory invested into these shortcuts. Time to
ask for help :-)

--
Thanks in advance,

Todd Thomas

*"It's a frail music knits the world together."-Robert Dana*

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