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I was surprised they did not use them already since tagged pointers is an ancient idea implemented in many languages. I guess they might not have been useful en

by jeltz 13y ago

I was surprised they did not use them already since tagged pointers is an ancient idea implemented in many languages. I guess they might not have been useful enough in ObjectiveC for 32 bit architectures.

rsynnott 13y ago
They already use them in 64bit Objective C on the desktop.