xo-umbrella2/BACKLOG.md

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# reader2
## boolean operators
^ (xor), | (or), & (and), ~ (not)
# gc
## add_virtual_root
Explicit alternative to `add_gc_root_poly()` for virtual roots.
Since gc doesn't touch data pointer for virtual roots, we can pass
`obj<AGCObject>` instead of `obj<AGCObject>*`.
Will evolve some awkwardness in VSM: having to construct a purposeless
`obj<AGCObject,DVirtualSchematikaMachine>` just to appease the `add_gc_root_poly` signature.
## remove_root
Remove root doesn't work.
Reimplement root vector using DArenaVector or perhaps doubly-linked list.
## mutation_log
Need to implement! Copy from original gc
## facets
Collector facet should use json5 idl for consistency