Simplify std.traits.isBoolean

[n8sh]

No description provided.

[dlang-bot]

Thanks for your pull request, @n8sh!

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Testing this PR locally

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dub run digger -- build "master + phobos#7684"

[pbackus]

Buildkite failure is due to your branch missing the commits from #7678. Rebasing should fix it.

[ljmf00]

BooleanTypeOf check for alias this of type bool, can you do this with T : bool ?

struct B
{
    bool val;
    alias val this;
}

[pbackus]

@ljmf00 This case is covered by the unit tests; take a look.

[pbackus]

Now the Buildkite failure is due to the new release of dlang-requests breaking the CI script.

PR here: dlang/ci#436

[ljmf00]

@ljmf00 This case is covered by the unit tests; take a look.

Yeah. Didn't know that SubTypeOf does that 👍