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…llPositions() under dump lock
assign proper no_entry_value instead of arbitrary 10000
…g positions assign proper no_entry_value instead of default 0L
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This should primarily fix issues when a modification of a TLongLongHashMap occurs while iteration is in progress within #keys(). The most obvious issue is an out-of-bounds array access due to removal; other possible corruptions might be more subtle.
Furthermore, extractions of positions from DumpIndex implementations have apparently always been problematic, insofar as 0L is a perfectly valid position in any dump, though until now the TLongLists used in the retrieval have never been initialized with a non-zero no_entry_value. Except for UniqueIndex, where the no_entry_value had been initialized to a rather arbitrary 10_000L; if this position was ever the actual start of an externalized value inside the dump, we must have missed it consistently in the list of extracted positions.