diff --git a/todo.md b/todo.md
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--- a/todo.md
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@@ -1,10 +1,9 @@
 # todo
 
-- cleanup codebase
 - better error reporting and stack traces in strict mode
 - auto-enable of strict mode depending on compiler optimizaton level
-- check smoothness of spring at high frequency updates
-- have reactive recomputations track sources dynamically
+- investigate if weak table iteration can be invalidated
+- have reactive recomputations track sources dynamically?
   - addresses case where sources are used in if-branching guarded by another
     source
   - performance implications