Parameters with uppercase letter? Is it possible to handle querystring parameters in webform module in Drupal 8.x with Uppercased letters like in this example? 
example.com?collectionId=123 (notice uppercase "I")

Webform fields requires machine names (capital letters not allowed).
Currently i get forms pre-filled as expected using collectionid=123 instead of collectionId=123 but in my current scenario using the capital letter is a requirement in order to keep some legacy external process working untouched.

Any suggestions?
You need to write some custom code to lowercase the query string parameters before the webform is built and displayed.

Another hack would be to pass the query string parameter using a token [current-page:query:collectionId]