Deep Ruby
summary
Ruby’s object model favors runtime behavior over static types, with open classes, per-object singleton classes and module inclusion used to compose behavior; benchmarks show using a singleton class to add a method is 5–10x faster than heavy instance_eval. A real tool, decub, is built to check documentation coverage by surgically hooking into modules and classes. Advice: prefer define_method/instance_variable_set over eval where possible, inject behavior per object for different web services, and avoid alias_method_chain is Satan style hacks.
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