cast(T[1]) succeeds for structs and static arrays, but fails for basic types

[Herringway]

struct Bar {
    int value;
}
void main() {
    auto bar = Bar(42);
    (cast(Bar[1])bar)[] = Bar(1); // OK!
    assert(bar.value == 1);
    int foo = 42;
    (cast(int[1])foo)[] = 1; // Error: cannot cast expression `foo` of type `int` to `int[1]`
    assert(foo == 1);
}

It is occasionally useful to be able to slice scalars (for use with std.stdio.File.rawWrite, for example), so I would like to see this more consistently supported.

[ntrel]

Looks like a duplicate of #18345.