Top clap issues

`clap_app!` can't have default arguments with numbers/some characters.

builder macros medium bug 3.x

PropagateGlobalValuesDown not working when arg has default value

subcommands easy bug 2.x

Question: Can subcommands define arguments?

RFC / question

"invalid option definition" in ripgrep Zsh completion

generator easy need to have bug 2.x

Panicking default_value due to converting YAML Real to String

RFC / question

`App::with_defaults` pulls clap's author and version

app builder macros hard urgent bug 2.x

Using a binary name with an underscore leads to panic on completion generation

generator subcommands urgent bug 2.x

Multiple values separated by a delimiter _only_?

parsing medium nice to have RFC / question bug 2.x

Macro undefined when using YAML

RFC / question