Duplicate parameter error

[nowindxdw]

when we use "extendify" to merge different *.yaml in different folders
we found if we defined one parameter like:

  keywords:
    in: query
    name: keywords
    required: false
    type: string

and in another place:

  keywords:
    in: query
    name: keywords
    required: true
    type: string

we see the different "required" cause error in merge yaml.
would you please add some check for duplicate parameters ?