Suggestion: Create util for making array items unique

[MB-web]

Found this in one of my projects. Probably this can be done better and escpecially more performant.

/**

• Produces a duplicate-free version of an object array, using new Set() for test equality.
• Not meant to be used for array which items are of primitive type.
  */
  export default function(input: T[]): T[] {
  if (!Array.isArray(input)) {
  return [];
  }

return [...new Set(input.map(element => JSON.stringify(element)))].map(element => JSON.parse(element)) as T[];
}