Release v0.0.18

Helptext + default value improvements!

Release v0.0.17

Fix faulty enum check during helptext generation

Release v0.0.16

Helptext improvements, fix enum in Literal regression.

Release v0.0.15

Default subcommands, literal metavar tweaks.

Release v0.0.14

Fix metavars for generics

Release v0.0.13

Significantly improved generic handling

Release v0.0.12

Support booleans in fixed-length tuples

Release v0.0.11

Fix % in docstrings for boolean fields.

Release v0.0.10

Fix `%` in docstrings, version bump

Release v0.0.9

Serialization API, inherited docstring fix