fix: Make arg!(--flag <value>) optional by default
#4207
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This was ported over from the usage parser which modeled after docopt. We just never got around to implementing the rest of the syntax. However, when considering this as a standalone feature, an `arg!(--flag <value>)`, outside of other context, should be optional. This is how the help would display it. Fixes clap-rs#4206
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This was ported over from the usage parser which modeled after docopt. We just never got around to implementing the rest of the syntax.
However, when considering this as a standalone feature, an
arg!(--flag <value>), outside of other context, should be optional. This is how the help would display it.Fixes #4206