Ruby 3.4: Gradual Transition to Frozen String Literals

Ruby 3.4 initiates a multi-version transition towards frozen string literals by default. Currently, Ruby 3.4 offers opt-in warnings when deprecation warnings are enabled, ensuring backward compatibility. Warnings will be enabled by default in Ruby 3.7, with frozen string literals becoming the default in Ruby 4.0. This change promises performance gains through string deduplication, reducing garbage collection and memory usage. The article details how to enable warnings, fix issues, and migrate existing code, advocating a phased upgrade approach.