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diff --git a/todo.md b/todo.md
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+++ b/todo.md
@@ -66,6 +66,7 @@ super ultra important things:
 ```
 	figure out why
 - Mac OS X 32-bit builds don't call runtime.sighandler() on a Cocoa exception like the 64-bit builds do
+	- does array index out of bounds on 32-bit Cocoa not generate a SIGTRAP like invalid selector does? need to experiment... or is something clobbering SIGTRAP? I didn't catch it in my tests here...
 
 important things:
 - make specific wording in documentation consistent (make/create, etc.)