Another aspect is, that frames are the only kind of object reference
source which is not accessible by reflection.  Having some kind of
reflective access to this would allow several new behaviors in the
meta layers.

I've done a lot of work in pushing reflection to the limit, and being
able to scan and mutate the stack would be absolutely awesome.  With
this, e.g. Ruby's object space would be implementable in plain Java,
as would Smalltalk's become:.

Kresten

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