Duplicate entries aren't removed after schema alter from [default] to [int]

[mangalaman93]

cc: @animesh2049 @pawanrawal

Steps to reproduce:

1. Insert the below mutation in dgraph.

{
  set {
    <0x1> <value> "1" .
    <0x1> <value> "0" .
  }
}

2. Query the schema.

schema{}

Result

{
  "data": {
    "schema": [
      {
        "predicate": "value",
        "type": "default",
        "list": true
      }
    ]
  },
}

Note: type of value is default.
3. Now do an alter.

<value>: [int] .

4. Now do the same mutation as step 1

{
  set {
    <0x1> <value> "1" .
    <0x1> <value> "0" .
  }
}

5. Run this query

{
  q(func: has(value)) {
    uid
    value
  }
}

Response:

{
  "data": {
    "q": [
      {
        "uid": "0x1",
        "value": [
          0,
          1,
          1,
          0
        ]
      }
    ]
  },
}

Expected Response:

{
  "data": {
    "q": [
      {
        "uid": "0x1",
        "value": [
          0,
          1,
        ]
      }
    ]
  },
}

[minhaj-shakeel]

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