The validation process modify the original request

[leonardo-speranzon]

Describe the bug When it validate a query parameter that in the openapi we defined it as an array structured like this:

name: param
    in: query
    explode: false
    schema:
        type: array
        items:
              type: number
    example: 11,22,33
    allowReserved: true

It converts the query parameters from a string to an array of string, so from 'val1,val2,val3' to ['val1', 'val2', 'val3']. Even if this can be considered useful there are a some situation in which the use of validation middleware should be transparent to the rest of the project.

To Reproduce Express server implementation:

const app = express()
app.use(
    OpenApiValidator.middleware({
        apiSpec: './openapi.yaml',
    }),
)

app.get('/test', (req:Request,res:Response,next:NextFunction)=>{
    console.log(req.query)
    res.status(204).send()
})

Openapi definition:

/test:
    get: 
        parameters:
            - name: param
                 in: query
                 explode: false
                 schema:
                 type: array
                 items:
                     type: number
                 example: 11,22,33
                 allowReserved: true
        responses:
            '204':
                description: No Content

Sending a GET to the endpoint <host>/test?param=101,102,103 would result in the console log of { param: [ 101, 102, 103 ] }, instead if we remove the OpenApiValidator.middleware we obtain the log { param: '101,102,103' }.

Actual behavior The request is modified by the validator.

Expected behavior The validator should validate that the string represent a valid array but without changing it in the original request. Or at least should exist an option (that i have not found in the documentation) to get this behaviour.