`type: null` generated as "any object" record

[fastcat]

Schema:

$schema: "https://json-schema.org/draft/2020-12/schema"
type: object
additionalProperties: false
required: [nullProp]
properties:
    nullProp:
        type: null

Generate with: npx --package=json-schema-to-typescript@^15 json2ts -i schema.yaml -o schema.ts
Produces (minus headers):

export interface Schema {
  nullProp: {
    [k: string]: unknown;
  };
}

Expected:

export interface Schema {
  nullProp: null;
}

Workaround: use tsType