Tag: correctness

All the articles with the tag "correctness".

• Fire-and-forget doesn't survive on Cloudflare Workers

  5 Jun, 2026·3 min read

  A view counter returned 204 on every call and never moved. Workers can cancel work still pending after the response unless it is passed to waitUntil.

• Your error handler is inside the cache

  23 Apr, 2026·3 min read

  A thirty-second backend restart became an hour of 404s, because a try/catch inside a "use cache" function cached the failure as a value.

• Idempotent writes don't make side effects idempotent

  19 Mar, 2026·4 min read

  Making an offline-first upsert safe to replay took an afternoon. The streak, points, awards and celebration it triggers each needed their own guard.

• Math.floor is not a floor

  26 Feb, 2026·4 min read

  Flooring a decimal for an API that wants strings: the obvious version drops a step, the clever one rounds up past the input, and neither throws.