message: Add operator param to Field comparator function property
diff: @@ -26,7 +26,7 @@ interface Field {
  placeholder?: string; // Value to be displayed in the placeholder of the text field
  validator?: RuleValidator; // Called when a rule specifies this field
  valueSources?: ValueSources | ((operator: string) => ValueSources); // List of allowed value sources (must contain "value", "field", or both)
  - comparator?: string | ((f: Field) => boolean); // Determines which (other) fields to include in the list when valueSource is "field"
  + comparator?: string | ((f: Field, operator: string) => boolean); // Determines which (other) fields to include in the list when valueSource is "field"
  }
  ```
  