3.1

Added

• grapheme_view and graphemes adapter which provide ability to iterate over grapheme clusters in sys_string and any UTF range.

Changed

• Unicode data has been optimized for better size/speed balance
• sys_string_t::hash_type has been changed from unsigned to size_t on some platforms.

Fixed

• Invalid character access in unicode mappings.
• Crash when sys_string_builder is re-used after build() on Apple and Python platforms.
• utf_ref_view and utf_owning_view now actually work with forward and input underlying ranges
• MSVC warnings when using std::hash<sys_string>