Singular params with Array[String] in body does not render correct JSON

I hit a bug when trying to use this param declaration:

params do
  requires :tags, type: Array[String], documentation: { in: 'body' }
end

Expecting this to create a schema and tag it on the request, it actually did a formData instead:

{
  "in": "formData",
  "name": "tags",
  "type": "array",
  "items": {
    "type": "string"
  },
  "required": true
}

I've been using this successfully everywhere else so this threw me off. I experimented and realized that the requires with Array[String] does not work if it's the only one. It immediately works when you add a non array/string param:

params do
  requires :tags, type: Array[String], documentation: { in: 'body' }
  requires :lol, documentation: { in: 'body' }
end

Results in:

{
  "name": "V1PostMortemsReportsReportIdTags",
  "in": "body",
  "required": true,
  "schema": {
    "$ref": "#/definitions/putV1PostMortemsReportsReportIdTags"
  }
}

And the schema:

{
  "type": "object",
  "properties": {
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "lol": {
      "type": "string"
    }
  },
  "required": [
    "tags",
    "lol"
  ],
  "description": "Add tags to a report"
}

What's also peculiar is that if you add multiple Array[String] to params it maintains the same bug, I've only been able to get to work the moment you add a non-array param.

Start by reproducing the issue with a params block containing only an Array[String] declaration and documentation in the body, then compare the generated formData output with the expected body schema. Trace the parameter-to-request documentation entry point and add a regression case covering array-only parameters; done means the generated request uses in: body with a schema and preserves the array item type.