Static methods on Stream and friends

[Kasper Nielsen]

> Stream.of() // for empty
> Stream.of(T) // for singleton
> Stream.of(T, T, T...) // for two or more
>

I've stopped using the latter form in my code. Because sometimes you
actually want to use an array for creating stuff and not just the vararg
signature. Having do something like Stream.of(a[0], a[1], Arrays.copyOf(a,
2)) is annoying and a waste of resources for larger arrays.