Schemas don't have the right order of key value pairs

[Amit0617]

I am working on some tooling over execution APIs where rendering of docs happening through Openapi schema.
I was taking transactions definition as defined in this repository.

There are some issues:

• There is nothing like

  type: 'null'

  rather it should be

  nullable: true

• title is defined before using $ref which results in local title to be replaced with title value inside $ref. So, to overwrite title value from $ref, it should be defined after $ref key.
• Also neighbour items of $ref get ignored and they are required to be wrapped under allOf.
  Example

  -         nonce:
  -          title: nonce
  -          $ref: '#/components/schemas/uint'
  +         nonce:
  +          allOf:
  +           - $ref: "#/components/schemas/uint"
  +           - title: nonce

Following are comparisons of both rendered
Before: where local title values are coming from $ref component

After: where desired title values are getting rendered

[Amit0617]

I will be doing all the changes necessary for own tooling docs. If this feels like an issue here, I would open a PR with required changes.