Strengthening the Ruby Ecosystem Part II: Merb
summary
Merb claims a small, modular core that boots in about 12 MB RAM and piles optional functionality into separate gems so apps pay only for what they use. It runs on Rack so a single app can short‑circuit JSON APIs with middleware, supports DataMapper/ActiveRecord/Sequel, compiles templates into methods for fast rendering, and exposes streaming by returning procs. Action argument binding uses ParseTree at boot. Version 0.92 is shipping; 1.0 remains pending.
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