What's Changed
- Constant flag by @iWiggins in #186
- Fix for duplicate arguments bug 117 by @iWiggins in #187
- honour joined-value separation for optional-argument flags by @metsw24-max in #188
- fix const-correctness of ConstantFlag::operator-> by @metsw24-max in #190
- scope duplicate-flag detection to command boundaries by @metsw24-max in #191
- allow nargs to work with joined values by @Taywee in #193
Full Changelog: 6.5.0...6.6.0