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In particular as far as I know .NET's decision to segment things into 3 generations is pretty unusual.

Looks broadly identical to JVM generations. Gen0 = eden space, Gen1 = survivor space, Gen2 = old gen (think they're calling it tenured now lol).

Unless I'm creatively remembering, Dave Moon's EGC (Ephemeral Garbage Collector) in Symbolics Genera in 1985(?) had three generations.