DRT reports packages array has non-unique elements when the elements differ

[pindec]

Original data example.

Packages (schema: "A list of URIs of all the release packages that were used to create this record package") look like this:

"packages": [
       "https://budeshi.ng/api/releases/1288/planning",
       "https://budeshi.ng/api/releases/1288/tender",
       "https://budeshi.ng/api/releases/1288/planning",
       "https://budeshi.ng/api/releases/1288/contract"
   ]

DRT report shows a structural error: Array has non-unique elements

[pindec]

Er, closing since there is repetition in that array.