• bytecodePrimValue seems to optimize only old blocks, and not full blocks
• bytecodePrimValueWithArg the same
• Check comments in initializeSpecialObjectIndices
• We should take a look at all the support for multiple bytecode sets methodUsesAlternateBytecodeSet: all the ALT class vars

strange API is:instanceOf:compactClassIndex:

In Pharo, we could remove the unused Context >> #closureCopy:copiedValues:

• check also all references to BlockClosure (the old implementation)

should also remove all old primitives primitiveClosureValue[NoContextSwitch|WithArgs]

• their orphan sends

There are some strange trampolines

• malloc / free