fix(complete): Fix zsh handling of multiple arguments

[intgr]

In zsh completion rules, the * denotes whether a flag/argument is allowed multiple times or not. However, in clap 4.0.0, all flag/option rules are always marked with * even if it makes no sense to supply them multiple times, such as --help.

This regressed for flags/options in 6f03b4f, the logic for handling non-multiple arguments with zsh was simply thrown out. While the consequences of this are minor, it's discouraging to see logic discarded without an understanding of why it's there.

The printing of positional multiple args was also tweaked, ValueRange::new(0..=1) should not be treated as multiple values.

[epage]

While the consequences of this are minor, it's discouraging to see logic discarded without an understanding of why it's there.

I can understand but I don't know zshells completion syntax and do not have ready access to experts in all of the supported shell completion systems to help catch problems.

Really wish there was a way to do end-to-end testing of completions

[epage]

clap_complete 4.0.1 is out