code: public static BindTransform lookup(TypeName typeName) {
  		BindTransform transform = cache.get(typeName);
  
  		if (transform != null) {
  			return transform;
  		}
  
  		transform = getTransform(typeName);
  
  		AssertKripton.assertTrueOrUnsupportedFieldTypeException(transform != null, typeName);
  		
  		// transform will be always valorized
  		cache.put(typeName, transform);
  
  		return transform;
  	}
docs: Get transformer for type.
  
  @param typeName
  the type name
  @return transform