public LongIterator getPropertyIterator(long start, long end, boolean atStart) {
		return new LongIteratorImpl(this, start, end, atStart);
	}
Creates an iterator over all the indexes that have this property within
the given range.

@param start The start address to search
@param end The end address to search
@param atStart indicates if the iterator should begin at the start
address, otherwise it will start at the last address.  Set this flag to
false if you want to iterate backwards through the properties.
@return LongIterator Iterator over indexes that have properties.
Ghidra/Framework/Generic/src/main/java/ghidra/util/map/ValueMap.java