[WEIRD]: Inconsistency between lambda/ternary and normal if/else. about sdk

[lrhn]

The conditional operator, ?/:, is an expression so it needs to have a static type. Its type is found as an upper bound of the static types of the two branches.

Here that's TInacccessibleMessage and TMessage.
Those two types have multiple common superinterfaes, Indexable, Versionable, Cacheable, EquatableMixin and maybeInaccessbileMessage. Each of those can be an upper bound of the two types, and the upper bound algorithm chooses Cacheable because it's "most specific" in some particular metric.
Not what you wan't, but not wrong.

Then you get an error because the context wants a MaybeInaccessibleMessage.

Luck has it that @stereotype441 has already implemented a better upper bound for cases precisely like this, where the result wouldn't match the context, but each branch's type would. It will then use the context type instead.
You'll have to wait for the next Dart release to get that behavior. Until then, either just stick with the if statements. (I personally find them more readable than the conditional expression), or add an as MaybeInaccessibleMessage cast on one of the branches (might have to silence an "unnecessary cast" warning, though).

So "fixed", just not released yet.

[busslina]

Thank you very much :) @lrhn