The migration that could not be rolled back, and nobody noticed until it mattered
A column drop is irreversible the moment it runs. Expand-contract exists because deploys and migrations do not move together.
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The retry that turned a blip into an outage
Synchronised retries from every client are a self-inflicted thundering herd. Jitter is the mechanism, not a detail.
Constraints flow down, sizes flow up, and fillMaxSize means something specific
One measurement pass means a child cannot ask its parent how big it is.
contentScale and Modifier.size are answering different questions
Image sizing depends on the modifier constraints and contentScale together. Understanding which one crops, which one fits, and where the aspect ratio comes from resolves most image layout bugs in one pass.
remember is not a cache, and the key is the whole contract
It is scoped to a composition and keyed by its arguments. A missing key gives stale state; a wrong one recomputes every frame.
LaunchedEffect(Unit) runs once, and that is usually the wrong once
Keyed to Unit means once per composition entry — not once per screen visit, and not once per user.
Two lines of autofill are worth more than a week of form polish
Compose's autofill is a semantics property on a text field. Declaring content types lets password managers and the platform fill forms correctly, and omitting it is why users abandon sign-up.
A LazyColumn without keys loses your scroll position and your animations
Without a key, item identity is positional — so an insert at the top reuses every slot's state for the wrong item.
Modifier order is not style, it is semantics
padding then clickable gives a different touch target from clickable then padding — and both look identical.
Recomposition is not re-rendering, and that is why your list stutters
Compose re-executes functions whose inputs changed. An unstable parameter means all of them.
Your custom font has a fallback, and you didn't choose it
A custom font covers a subset of Unicode. Everything outside it falls back, and the fallback decides how your app renders emoji, non-Latin scripts and symbols — usually without anyone checking.
iosTest needs a booted simulator, and CI does not have one by default
The native test binary runs on a device, so a missing simulator reads like a toolchain problem.