[
  {"op":"source","role":"price","kind":"F64"},
  {"op":"add","type":"SMA","name":"fast","bind":{"length":{"I64":5}}},
  {"op":"add","type":"SMA","name":"slow","bind":{"length":{"I64":20}}},
  {"op":"feed","role":"price","into":["fast.series","slow.series"]},
  {"op":"add","type":"Sub","name":"spread"},
  {"op":"connect","from":"fast.value","to":"spread.lhs"},
  {"op":"connect","from":"slow.value","to":"spread.rhs"},
  {"op":"add","type":"Bias","name":"bias","bind":{"scale":{"F64":0.25}}},
  {"op":"connect","from":"spread.value","to":"bias.signal"},
  {"op":"tap","from":"bias.bias","as":"signal"},
  {"op":"tap","from":"fast.value","as":"price"},
  {"op":"expose","from":"bias.bias","as":"bias"},
  {"op":"doc","text":"tapped: bias exposed and tapped as signal, fast tapped as price"}
]