Incorrect return type when mixing optional and non-optional keys

[RebeccaStevens]

Expected behavior

const foo: { a: true; b: string } = { a: true, b: "n" };
const bar: { a: false; b?: number } = { a: false };
const result = merge(foo, bar);

console.log(result.a); // false
//                 ^? a: false
console.log(result.b); // "n"
//                 ^? b: string | number | undefined

Actual behavior

const foo: { a: true; b: string } = { a: true, b: "n" };
const bar: { a: false; b?: number } = { a: false };
const result = merge(foo, bar);

console.log(result.a); // false
//                 ^? a: false
console.log(result.b); // "n"
//                 ^? b: number | undefined

[github-actions]

🎉 This issue has been resolved in version 6.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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