Why isn't skipOver(string, string) nothrow?

[Per Nordlöw via Digitalmars-d-learn]

Why isn't a call to

    skipOver(string, string)

nothrow?

I see no reason why it shouldn't be.

Further, this test should be qualifyable as nothrow:

@safe pure /* TODO nothrow @nogc */ unittest
{
    import std.algorithm.searching : skipOver;
    auto x = "beta version";
    assert(x.skipOver("beta"));
    assert(x == " version");
}