Values.FieldSourceContains a value.
type nonrec t = {isNull : BoxedBoolean.t option;A NULL value.
*)booleanValue : BoxedBoolean.t option;A value of Boolean data type.
*)longValue : BoxedLong.t option;A value of long data type.
*)doubleValue : BoxedDouble.t option;A value of double data type.
*)stringValue : String_.t option;A value of string data type.
*)blobValue : Blob.t option;A value of BLOB data type.
*)arrayValue : ArrayValue.t option;An array of values.
*)}