Replace the custom kset hash table implementation with the optimized
khash.h while maintaining identical functionality and memory footprint.
Changes:
- Replace custom kset_t struct with kh_set_val_t typedef
- Use KHASH_DECLARE/DEFINE macros for type-safe hash operations
- Add compatibility layer to preserve existing kset API
- Embed khash struct directly in RSet (same 16-byte footprint)
- Remove duplicate string.h include (provided by khash.h)
Benefits:
- Unified hash implementation across mruby core
- Eliminated ~200 lines of duplicate hash table code
- Automatic benefits from future khash optimizations
- Reduced maintenance burden with single hash implementation
- Identical performance and memory characteristics
The RSet structure maintains the same size through embedded khash
struct, and all Set class functionality remains unchanged.
Co-authored-by: Claude <noreply@anthropic.com>
Yukihiro "Matz" Matsumoto
e907995dcd