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In the opening keynote titled "Ruby 3 Today" at EuRuKo 2016, Yukihiro 'Matz' Matsumoto emphasizes the ongoing development and vision behind Ruby 3, highlighting its importance to the Ruby community. The main points discussed in the keynote are:

- **Vision of Ruby 3**: Matz presents Ruby 3 as a distant goal that aims for significant improvements while maintaining compatibility with existing versions. He recalls challenges faced during previous transitions and stresses the importance of clear goals for future progress.

- **Performance Goals**: The keynote introduces the slogan "Ruby 3 x 3," aiming for Ruby 3 to be three times faster than Ruby 2. Matz explains ongoing optimization efforts in garbage collection and the virtual machine, including the exploration of Just-In-Time (JIT) compilation as a method for achieving this ambitious performance target.

- **Concurrency and the Guild Model**: Matz discusses the need for improved concurrency in Ruby, which has historically struggled with the Global Interpreter Lock (GIL) that limits threading capabilities. He introduces the concept of 'Guilds', a new abstraction model for concurrency inspired by the actor model, designed to better utilize multi-core processors while ensuring safety and simplicity in threading.

- **Typing in Ruby**: Matz addresses the rising popularity of statically typed languages and their implications for dynamic languages like Ruby. He defends dynamic typing through the philosophy of duck typing, which prioritizes behavior over strict type definitions. The keynote concludes with thoughts on type inference as a potential solution to balance flexibility and error detection in Ruby.

- **Ruby's Future**: Matz underlines the urgency for Ruby to evolve to prevent stagnation and promote community involvement. He highlights the need for continuous innovation and contributions from Ruby users to help guide the language's direction. The final takeaway emphasizes the joy of programming in Ruby and the collaborative efforts required to enhance its ecosystem.

Overall, the keynote serves as an optimistic outlook on Ruby's future while inviting community support and engagement to realize the potential of Ruby 3.

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