How to assign and compare arrays to SumType?

[confuzzled via Digitalmars-d-learn]

Comparison between a Variant and an array is straightforward. How 
does one accomplish the same between a SumType and an array?

```d
import std.variant;
import std.sumtype;
import std.stdio;
struct S
{
    SumType!(double[]) data;  // {1}
}

void main()
{
    Variant v = [1.7, 2.7, 3.7, 4.7, 5.7];
    assert(v == [1.7, 2.7, 3.7, 4.7, 5.7]);

    S s;
    s.data = [1.7, 2.7, 3.7, 4.7, 5.7]; // {2}
    assert(s.data == [1.7, 2.7, 3.7, 4.7, 5.7]);
}
```

Resulting Error:

var.d(17): Error: template \`opEquals\` is not callable using 
argument types `!()(double[])`
/Users/anju/dlang/dmd-2.109.0-beta.1/osx/bin/../../src/phobos/std/sumtype.d(712):
        Candidate is: `opEquals(this This, Rhs)(auto ref Rhs rhs)`
 with `This = SumType!(double[]),
      Rhs = double[]`
 must satisfy the following constraint:
`       !is(CommonType!(This, Rhs) == void)`

Also, assuming that {1} read "SumType!(double)[] data;", what 
would be the proper way to accomplish the assignment at {2} and 
the subsequent comparison.

Thanks,
--confuzzled

P.S. Is news.digitalmars.com still operational? I'm unable to 
access it through Thunderbird.