should dotProp.has({foo: undefined}, 'foo') be true ?

[qiu8310]

var a = {foo: undefined}

console.log(dotProp.has(a, 'foo'))  // false

console.log('foo' in a) // true
console.log(a.hasOwnProperty('foo'))  // true

[stevemao]

cc @thatjessicakelly

[sindresorhus]

Yes, that's a bug.

[stevemao]

@qiu8310 Can you try #29?

[qiu8310]

I wrote a different version libs/lang/DotProp.js, and test file libs/lang/test/__DotProp.js.

Would you like to merge it?

[stevemao]

@qiu8310 if you can prove that implementation is better (we have good perf tests here) 😄