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Fixed
Fix refs prefetch over-fetching (#40). Only prefetch refs for
application-level objects, skip ZODB-internal data structures
(persistent., BTrees., Persistence.*, ZODB.blob) whose refs
cascade into massive over-fetching during traversal.
v1.9.0 made cold-start 40-84% slower; this fix restores the
benefit by limiting prefetch to content objects whose refs
(annotations, workflows) are worth loading ahead.