Hi, this happened to me recently and I'd like some advice from this group:

I find myself wanting to combine html attributes from two sources, 
specifically lists of classes for an input field. 
A view, with access to model state, uses classList to generate classes that 
pull in state based colouring.
That gets passed in to a function that behaves like a template and renders 
the field in a way that is suitable for where it appears in the app (fields 
get different classes when rendered in different places). Thus I end up 
with two Attribute Msg instances that I want to combine for the attributes 
of my input tag. In particular I want the classes specified in each of 
those attribute lists to be concatenated. 

So, have I taken a wrong turn in my app design, is there a solution for 
combining attributes, or should I write one?

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