JavaScript, merge 2 arrays of objects, remove dupes, irrelevant of length, keys or reference

script.js

/* 
 You saw it here first, out of the 8k dupes on stackoverflow, none address diff length b array, diff keys or reference.
 
 Leave a comment if you know a better way
*/
const a = [{ a: 'a' }, { b: 'b' }];
const b = [{ a: 'a' }, { c: 'c' }, { x: 'x' }, {}];

const merge = (a, b) => [
  ...new Set([
    ...a.map(i => JSON.stringify(i)),
    ...b.map(i => JSON.stringify(i))
  ])
].map(i => JSON.parse(i))

console.log(merge(a, b))