Playground: paste a payload, watch it get measured - #19
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…even, unsafe-integer rejection, explicit traffic selector, strict inflate probe, trained-nothing state, live CTA and mobile nav
…cellation, selector survives errors, training-state honesty, wrapper depth, float-semantics footnote
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A /playground route on hyperfly.dev. Paste any JSON response — or an array of responses from the same route — and everything runs client-side: schema inference, profile training, encoding with the real codec (fflate deflate hooks), and per-message numbers for JSON / JSON+gzip6 / Hyperfly / Hyperfly Profiled, methodology-matched to the benchmark section (full envelope, minified JSON, gzip 6).
The corpus mode is the showpiece: it trains a profile in the browser and shows what it learned — dictionaries, id grammars (
evt_{base36×6}_{base16×8}), derived columns — with the codec artifact priced honestly (full serialized artifact, break-even from the artifact delta, everything labeled in-sample).Honesty guardrails from two codex review rounds: visible in-sample disclosure beside the bars, inferred schema shown verbatim with assumption tracking, bare integers beyond ±(2^53−1) rejected instead of silently rounded, JS parse semantics disclosed, strict single-stream inflate probing, explicit traffic/one-response selector, depth guard, and a round-trip verification on every measurement. Nothing is uploaded — stated on the page.
Also makes the landing's "benchmark playground — soon" CTA real and keeps the playground link visible in mobile nav.
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