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NamedVariant on constructor

Tried this example and got cast exception converting Map to Integer.  Should the print statement at the end use the generated map constructor as expected?  (Note: I am compiling with indy variant; tried to use web console to try vanilla MOP...)

import groovy.transform.*

import groovy.transform.options.*


class Color {

  final Integer r, g, b

  @NamedVariant @VisibilityOptions(Visibility.PUBLIC)

  private Color(Integer r, Integer g, Integer b) {

    this.r = r

    this.g = g

    this.b = b


  public static final Color BLACK = new Color(0, 0, 0)


print(new Color(g:12, b:42, r:12)) // gives org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object '{}' with class 'java.util.LinkedHashMap' to class 'java.lang.Integer'