- Add explicit nil checks to toInt, toInt64, toFloat64 for consistency
- Standardize error messages to use %q for user-provided strings
- Export GetGrammarData for symmetry with SetGrammarData
- Standardize String() doc comments to "the TypeName" pattern
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Move all exported types to interfaces.go for consistent organisation.
Rename interface.go → interfaces.go.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Move MissingKeyHandler, MissingKey, MissingKeyAction, and PluralRule
function types to interface.go for better discoverability.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>