I think the optimal time to upgrade something is just after the majority, so bugs have been filed, but the maintainer is still interested.
miniblog.
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The vast majority of libraries have a single maintainer. Even if you weight by downloads, roughly half of downloaded libraries have a single maintainer too.
35
I hear people say that Go is often hard to search online (hence sometimes "Golang"), but the vast majority of language names are common words. Names with punctuation (C++, C#) are hard too.
Is this a big problem in practice? "Perl" isn't a dictionary word, but it's an exception.
It took me way too long to realise that Arc<Mutex<T>> is basically a way to create multiple &mut T references (with runtime constraints).
This means that you can use plain &T and &mut T in the vast majority of your code. Most code doesn't need to care there's a mutex.