assert.strictEqual(invert([[10, Infinity, .1]])(19), 20);
assert.strictEqual(invert([[10, Infinity, .1]])( 9), 9);
assert.strictEqual(invert([[0, 100, .1], [100, Infinity, .2]])(170), 200);
assert.strictEqual(invert([[10, Infinity, .1]])(19), 20);
assert.strictEqual(invert([[10, Infinity, .1]])( 9), 9);
assert.strictEqual(invert([[0, 100, .1], [100, Infinity, .2]])(170), 200);