Infer nullable from schema

OAS 3.1 is removing nullable from the specification for the JSON schemas in favor of using the JSON-schema way which is

{ "type": ["string", "null"] }

{ "oneOf": [ { "type": "string" }, { "type": "null" } ] }

Redoc right now sort of supports the second option (won't show the Nullable label though) and doesn't have any support for array type.

The expected result would be to treat both options exactly the same way as

{
  "type": "string",
  "nullable": true
}