arguments

Question

What does the code snippet to the right output by console.log?

Snippet

function log(a,b,c,d) {
  console.log(a,b,c,d)
  arguments[0] = 'bfe'
  arguments[3] = 'dev'
 
  console.log(a,b,c,d)
}

log(1,2,3)

Source

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