Update a multiple/single (non)binary variable on a case instance asynchronously

This endpoint can be used in 2 ways: By passing a JSON Body (RestVariable or an array of RestVariable) or by passing a multipart/form-data Object. Nonexistent variables are created on the case-instance and existing ones are overridden without any error. Any number of variables can be passed into the request body array. Note that scope is ignored, only global variables can be set in a case instance. NB: Swagger V2 specification doesn't support this use case that is why this endpoint might be buggy/incomplete if used with other tools.