v0.9.5

• #262 - Implement async: true option for model.start() (@nateps)
  • This is an experimental performance option for Model#start.
    • When a reactive function's inputs change, by default the function gets immediately and synchronously evaluated, updating the output data.
    • This new async: true option defers function evaluation until the next tick, which also lets it dedupe multiple input changes that happen in the same event loop.
  • In general, the evaluation delay means async: true should only be used in Derby components, and only when the controller does not directly read from the output path via e.g. Model#get.
    • Normally, when controller code changes a reactive function input, it can then immediately read the reactive function output and see the effects of the change to the input.
    • With async: true, the reactive function's output will continue to have the old value until the next event loop.
    • Chained reactive functions in components can use async: true, as long as the controller doesn't directly read any values downstream of the async: true functions.