Do you ever blindly assume there's a prelude? Do you ever add a new crate to
Cargo.toml and then immediately add
use <crate>::prelude::* to your source?
Is generally considered to be idiomatic to have a prelude, even if the crate is relatively small?
I don't think there's an unconditional need for a prelude. It doesn't even depend on the size of the crate, but the complexity. A prelude helps the user avoid many deeply nested imports, while still preserving the author's right to structure the modules as ornately as necessary.
In general, I strongly dislike preludes. I use every name explicitly because I want to know what is in scope, and where it came from. The two exceptions I make are for the standard prelude (because in my mind those items are practically just part of the language), and for project-specific preludes (which only contain things I'm importing >80% of the time anyway).
I can't recall ever seeing anyone upset that a crate didn't provide a prelude. But, then, I'm obviously quite biased.
Ditto. Preludes make security audits challenging.
And they — or rather, glob imports, whether or not the module is called a prelude — make it hard to understand code someone else wrote, especially if there is more than one of them.
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