Unique does not handle non string, number or symbol values correctly

[jordydhoker]

When calling unique with non string, number or symbol values, it doesn't handle it correctly when not using a toKey function.

This is caused by using an object as the key-value pair for the uniqueness check, as an object can only handle string, number or symbol as keys. Typescript would have caught this issue but it was bypassed using as any.
Using a Map would fix this as it can handle all values as keys.

[aleclarson]

Hi @jordydhoker, this issue has a fix available in radashi@beta today (see #10). An official release is pending. We'd love to have you participate in the discussion and/or development of the radashi-org/radashi fork. 😄