README out of date

The README makes it seem that --until-error does not require an argument:

Or until it fails with --until-error (which also accepts an optional error code):

But when I try it without an argument, I get this:

error: The argument '--until-error <until_error>' requires a value but none was supplied

USAGE:
    loop <input> --count-by <count_by> --every <every> --offset <offset> --until-error <until_error>

So I think that maybe --until-fail is what I want, based on this:

Or, if you have a list of files but need to find the one which causes your program to fail:
$ ls | loop './my_program $ITEM' --until-fail;

But I get this:

error: Found argument '--until-fail' which wasn't expected, or isn't valid in this context

And I still don't know how to run a command until it fails. Seems like it is currently impossible.

Start with the README examples for --until-error and --until-fail, then compare them with the loop command's documented help and the reported argument errors. Update the README so it only describes supported flags and accurately explains how to run a command until it fails; verify the corrected examples against the CLI.