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For mlvm, BOM is JVM minus Java-originated restrictions, especially static typing. Specifically, fully late-bound call sites and interfaces, free-range method handles, exotic names, tail calls, continuations, tuples, etc. The limit to this list is the inventiveness of the community.

Hardest Problems

• Introspection of runtime structures:
  • Pythons sys._getframe()
  • Rubys ObjectSpace
  • Asking Java packages for classes is difficult due to classloading + namespace merging
• Class and object modification - "monkey patching"
  • Call site volatility

Interesting Techniques