Constraints that make developers faster

Agent tooling's real cost metric is tokens burned on iteration, favoring idiomatic TypeScript over stricter custom languages or Python.

• Hack and Skip origins: Julien Verlaguet built Hack (TypeScript-like typing for PHP) at Facebook to tame large dynamic codebases, and later Skip, a reactive-programming language for incremental computation.
• Typing is a spectrum: Verlaguet distinguishes static/dynamic from strong/weak typing — TypeScript is only 'optionally typed' and 'really cannot be trusted' versus truly strong systems like Python.

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