What's Changed

• Deprecate JSON::State#[] and JSON::State#[]=. Consider using JSON::Coder instead.
• JSON::Coder now also yields to the block when encountering strings with invalid encoding.
• Fix GeneratorError messages to be UTF-8 encoded.
• Fix memory leak when Exception is raised, or throw is used during JSON generation.
• Optimized floating point number parsing by integrating the ryu algorithm (thanks to Josef Šimánek).
• Optimized numbers parsing using SWAR (thanks to Scott Myron).
• Optimized parsing of pretty printed documents using SWAR (thanks to Scott Myron).

Full Changelog: https://github.com/ruby/json/compare/v2.15.2...v2.16.0