immer

Enable loose iteration by default

Simplify some iteration checks

Allow passing type to get/set utils to skip archetype lookup

Convert assigned_ to Map

Enable loose iteration

Replace recursive tree finalization with targeted callbacks

Added cleanup callbacks for each draft that's created

Added callbacks to handle root drafts, assigned values, and recursing inside of plain values

Updated state creation to return [draft, state] to avoid a lookup

Rewrote patch generation system to work with callbacks instead of during tree traversal