* use tags instead of graph_rewrite_map in rangeify
* new style, add realize
* metadata works
* simple failure
* fix
* loops
* stuff becomes a NOOP when you remove it
* stuff becomes a NOOP when you remove it
* tags on bufferize
* bmnist works
* locals don't work
* shippable
* fix some tests
* simpler map_realize
* remove const hack
* debuggable test
* broke
* assign test
* straight up bug
* wooo it passes
* sink shouldn't be there
* fix ops
* bmnist
* kv cache ish
* Set RANGEIFY context variable to 0
* should work normal
* better
* types
* hacks to fix test_symbolic
* pm_add_buffers
* tests should pass