Changelog

All notable changes to Fluxon are recorded here, newest first. The format follows Keep a Changelog; the language follows Semantic Versioning — breaking changes to the language only arrive with a version bump.

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v0.1.0 — June 2026

The first tagged release. The language is feature-complete against the Agent Spec: every battery in the spec is implemented, and the Phase 0 stability bugs are all closed.

Added

• Language core — indentation blocks, =/<- bindings, fn/lambda functions, if/elif/else, the single each loop, match, and the |> pipe.
• Error model — ! (propagate), ?? (nil-coalesce), fail (raise, with an optional HTTP status), and try/catch (recover and continue).
• Batteries — http (server + client), db (SQLite, transactions, tbl schema with declarative migration), ai (ai.ask/ai.json/ai.run with automatic provider detection and OpenAI-compatible overrides), ws, cron, queue, reg, json, env, log, plus the core list/map/str/math/ rand/time methods.
• Tooling — assert + fluxon test, an interactive REPL, the par parallel fan-out primitive, leveled log output ($LOG_LEVEL / $LOG_FORMAT), and the .pkg module manifest format.

Changed

• ai default model is claude-opus-4-8 when ANTHROPIC_API_KEY is set.
• db connection is read from $DATABASE_URL automatically (default sqlite:fluxon.db) — no connection code.

Security

• rand is backed by the OS cryptographic CSPRNG (no predictable tokens).
• Authorization headers are dropped on cross-origin redirects.
• Request body size is limited by default (max_body, 10 MiB) — a DoS guard.