Ensure items are set for array for backwards compatibility

[josevalim]

This keep backwards compatibility with v1.5.0.

[josevalim]

To add more context, the following code:

    optional(:arguments).array(:str?, :float?)

Generates:

{
  "type": "array",
  "items": {
    "type": ["string", "float"]
  }
}

JSON Schema treats "type": ["string", "float"] as a OR but Dry::Schema considers array(str?, float?) to be an AND.

My attempts to make Dry::Schema generate or clauses have generated verbose anyOf nodes, such as this:

array do
  each { str? | float? }
end

generating this:

{:anyOf=>[{:type=>"string"}, {:type=>"boolean"}]}

While a lean "type": ["string", "float"] output would be more convenient for LLM usage. I am not sure if there is an easy to generate OR types in JSON with OR semantics in Dry::Schema.

Another option is to generate this:

Suggested change

	property_schema[:items] = {}
	property_schema[:items] = { type: ["array", "boolean", "integer", "number", "null", "object", "string"] }

But I chose to keep backwards compatibility for now.