While being able to branch would be very powerful, and calling different chains from the end of the branching chain would work and is something I might use, I'd still rather be able to feed a calculated constant down a chain.
I'm thinking something along the lines of maybe code in a module that sets a variable in a special way, and then be able to use that variable in a template where a constant would go in a form in the chain (like, a tag field for instance).
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