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dumb question I thought the GC tunings, e.g. RUBY_HEAP_MIN_SLOTS, were only available in REE, rather than MRI?

starting with 1.9.3 they are also available on MRI, though not sure about 2.0.0 as there GC are highly refactored/optimized.

> Starting with Ruby 1.9.3, the GC in mainstream ruby can also be tuned

Would love to see the updated test once Ruby 2.0 is out in a few days time.

Brilliant - thanks, hadn't found that info.