Arrays are not combined as arrays

[edahlseng]

When package.json files have arrays for a field (such as for contributors) the combined output is an object keyed by index, rather than an array

[eclectic-coding]

I can confirm. In my case, if one file has the kyword arrays are combined as:

"keywords": {
    "0": "one",
    "1": "theme",
    "2": "WordPress ",
    "3": "plugin"
  },