Add optimization comment in stream_cmp
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				@ -16,7 +16,9 @@
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 * 	< 0 if a < b
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					 * 	< 0 if a < b
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 * 	= 0 if a == b
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					 * 	= 0 if a == b
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 *
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					 *
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 * Invert the comparison function to get a min-heap instead
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					 * Invert the comparison function to get a min-heap instead.
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					 * TODO: Consider using an offset from heap_node_t to the int64_t to be
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					 * compared, so we can optimize the heap insertion.
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 */
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					 */
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static inline int
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					static inline int
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stream_cmp(heap_node_t *a, heap_node_t *b)
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					stream_cmp(heap_node_t *a, heap_node_t *b)
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