Error index always 0?

[ncamomot]

const validationError = jsonpatch.validate([
  { op: 'replace', path: '/firstName', value: 'first' },
 // middleName does not exist
 { op: 'remove', path: '/middleName', value: 'middle' }
], 
{ firstName: 'first', lastName: 'last' })

validationError.index // = 0

I was expecting it as 1. I am wrong to expect that?

[beam-bence]

This issue may be related to #300
Constant 0 is passed as the index parameter.
Here's the suggested fix and pull request #301