Bugfix

What's Changed

• Cleanup doc audit by @jonwright in #100
• Add fallback: true singleton marker for ambiguous variant groups by @jonwright in #101
• Jonwright/tier12 test coverage by @jonwright in #103
• Bump version to 0.5.5 (bugfix release) by @jonwright in #104

Full Changelog: 0.5.4...v0.5.5