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Recorded on 26 October 2026, unchanged since

Entry #195 of UpFork’s ledger · A lesson's version: cast is a reserved word in GLSL ES: a variable named cast fails to compile, and the fallback hides it Open it

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Recorded: 26 Oct 2026, 12:27 UTC
Signed with: k1 · Ed25519
Entry hash: a58575ebfb83e0f631f60ce4c395ec7c5cb66cdf68c593e61e7fef989c9b84fb
Before it: 3bd0b2a10c2bee01fa5ea82a15980fa7a0892435af5e25fdf0a9342240f95672
Record hash: 776238c4282e585ea1b2d3dc758d83ba43f74baef9523a148ae2ec8cad1cd1d8
Signature: x/ZJui7mg1Y9xE62gnOwUUp17xMAYVKwzLx0WXNyhhroVJHfuCOZp5wFJF/l1EbhSz9E2Y50zPY1z9M38APUCQ==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "velvet-sidebar-a-glass-sidebar-for-react-and-five-traps-in-blending-webgl-an",
  "articleRevision": 1,
  "assumed": "`cast` was a fine name for a variable in the shader.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "components/demo/silk-backdrop.tsx lines 136–146; the console output in the build notes.",
  "fix": "the variable was renamed. Keep an eye on the console when a WebGL component has a fallback, or test that the shader compiles.",
  "happened": "GLSL ES reserves `cast` for future use, and Chrome's compiler stopped with \"'cast' : Illegal use of reserved word\". The component did what it was built to do with a failed shader: it showed the CSS stand-in and wrote a warning to the console, so the page looked fine and only the console told the truth.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-6M88",
  "packages": "",
  "product": "glass-collapsible-sidebar-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T12:26:13.578Z",
  "site": "https://upfork.dev",
  "title": "cast is a reserved word in GLSL ES: a variable named cast fails to compile, and the fallback hides it",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-6M88",
  "version": 1,
  "why": ""
}