Eliminating SegPrefExpress in most places, especially where there wasn’t really any preference.
Eliminating special case knowledge about garbage collection from the arena.
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Change: 184279
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This doesn't work because the splay tree can't cope with homing in on a node (that appears big enough) then being told that it isn't suitable (because it doesn't have space in the right zone). The splay tree summary condition must be precise, as stated in the design. The splay tree isn't suited to this kind of search.
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Change: 184073
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This change will be integrated but ignored (-ay) to the gg-epcore/union sources, so that they retain HopeNames.
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Change: 24911
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This was achieved by partially undoing changelist 24817, including an accidental corruption of eventgen.pl.
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Change: 24877
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