Limit the number of statements in the output for t.true/t.false

Note, this issue is related only to #1154.

Given this assertion:

const obj = {
  a: {
    b: {
      c: [false]
    }
  }
};

t.true(obj.a.b.c[0]);

AVA will output the value of each statement (obj.a.b.c[0], obj.a.b.c, obj.a.b, obj.a, obj), which of course is not optimal, since the helpful values are probably only the last two. We should limit the number of statements to prevent a long list of unhelpful values.

[novemberborn]

This now needs https://github.com/concordancejs/concordance/issues/12 to land.

[novemberborn]

@hoschi yes thank you, that’s a nice way of thinking about it. It’s horribly complicated though! 😄