Why grade value update API gives 400 JSON Binding Error for a null grade update?

Hi All,We are using the PUT API "/d2l/api/le/(version)/(orgUnitId)/grades/(gradeObjectId)/values/(userId)" to update an existing grade item with a null value. We are passing the following JSON object in the request body.{    "Comments": {        "Content": "Comments.",        "Type": "Text"        },    "PrivateComments": {        "Content": "Private comments",        "Type": "Text"        },    "GradeObjectType": 1,    "PointsNumerator": null,    "PointsDenominator": 45}  When we submit the above request we are getting the following error: {    "type": "http://docs.valence.desire2learn.com/res/apiprop.html#json-binding-error",    "title": "JSON Binding Error",    "status": 400,    "detail": "Provided JSON is invalid or does not match the expected format."} Any idea on how to fix this error or how to pass a null value for the grade item?