passing list, hash to functions

I'm working on custom template functions to convert objects to json so I have:

public class JsonConverter implements TemplateMethodModelEx {
	public Object exec(List args) throws TemplateModelException {
         .....
          }
}

when I do this in a template:

                <#assign test3 = {"name":"mouse", "price":50}>
                ${exec.toJson(test3)}


the passed argument is a:
  
 private class SequenceHash implements TemplateHashModelEx  

 inside of a:

 final class HashLiteral extends Expression


I guess I was expecting a SimpleHash. I must be doing something wrong here.




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