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This commit adds the ability to create a new Microcosm for an existing history. These Microcosms will inherit state from their parents.
This is done through the new
fork()
Microcosm prototype method.Just want to get eyes on this. I imagine we won't ship this for 10.0.0 (but maybe we could?)
What's new
How it works
A history is shared between several Microcosms. When it changes, they all roll forward progressively.
History archives itself, emitting an
archive
event. This gives microcosms a chance to cache an action before it is disposed.Parent microcosms subscribe before forks, so they resolve first. Forks back fill state. For example, a parent microcosm that manages
users
will pass that data down to a fork that only manages a page of users.