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diff --git a/TODO b/TODO
index 83b46da..a27f07b 100644
--- a/TODO
+++ b/TODO
@@ -16,3 +16,4 @@
 * input prompt
 * better interactive error handling when interpreting from stdin
 * document ALL THE LIBRARIES
+* consider https://en.wikipedia.org/wiki/Hindley%E2%80%93Milner_type_system and finally make the stuff typed correctly