allOf : `type` of property contained in multiple subschemas is not correctly determined.

Given the following schema V1:

Foo:
  allOf:
    - properties:
        propA:
          type: string
    - properties:
        propA:
          example: "YEEHAA"

is changed to the following schema V2:

Foo:  
  properties:
    propA:
      type: string

openapi-diff incorrectly detects the following incompatible change:
Changed property type (object -> string)

It seems to me that the type of a property that is contained in multiple subschemas of an allOf is not correctly determined. Openapi-diff recognized the type of propA in schema V1 as an object, but this is not correct.

Start by reproducing the comparison between the supplied V1 and V2 schemas, focusing on Foo, allOf, and the repeated propA definition. Inspect how the diff determines propA's type across allOf subschemas. Done means the comparison no longer reports an incompatible object-to-string type change for this case.