Error when Intersect objects with same key

[thezzisu]

Step to reproduce

const A = Type.Object({
      a: Type.String(),
})
const B = Type.Object({
      a: Type.String()
})
const T = Type.Intersect([A, B])

output

Error: schema is invalid: data/required should NOT have duplicate items (items ## 1 and 0 are identical)

generated schema

{
  type: 'object',
  kind: Symbol(ObjectKind),
  additionalProperties: false,
  properties: { a: { kind: Symbol(StringKind), type: 'string' } },
  required: [ 'a', 'a' ]
}

expected

{
  type: 'object',
  kind: Symbol(ObjectKind),
  additionalProperties: false,
  properties: { a: { kind: Symbol(StringKind), type: 'string' } },
  required: [ 'a' ]
}

[thezzisu]

However there's a workaround:

const c = Type.Intersect([a as any, b as any])
c.required = [...new Set(c.required)]