fn called with input
fn called with input
err called with input
fn called with input
[Error: `add` is for async functions with signature f([arg1, [arg2, [...]],] cb) that have a cb argument at minimum.]
fn2 called with fn output
multiinputFn called with fn output is nice
done erred with [Error: fail]
multiinputErr called with fn output is nice
done called with fn2 output
done called with multiinputFn output
done erred with [Error: multiinputErr fail]