How is thisContext dealt with in SqueakJS ?
SqueakJS has full support for thisContext, non-local returns, resumable exceptions, etc. AFAIK it's the only web-based Smalltalk that is full-featured this way, including LargeInts, allInstances, finalization and so on. That's why it can run an unmodified Squeak image (even Cog/Spur images, but not Sista yet).
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