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