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For example, if I have a 100 phys damage skill with 200% effectivness of added damage, would added fire damage support give 44 damage or 88?
Edit: nvm I just realized it would double dip with added phys sources, definely not a thing.

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over 3 years ago - /u/Mark_GGG - Direct link

They are not. This is in fact the reason the wording of those was changed ages back to "gained as extra" instead of "added as" - previously there were no modifiers that distinguished added damage from base damage, so when we added those we had to make sure not to describe non-added damage as added.