THMAP_LEAF_BIT
#define THMAP_INODE_P(p) (((uintptr_t)(p) & THMAP_LEAF_BIT) == 0)
node_insert(node, slot, THMAP_GETOFF(thmap, leaf) | THMAP_LEAF_BIT);
target = THMAP_GETOFF(thmap, leaf) | THMAP_LEAF_BIT;
target = THMAP_GETOFF(thmap, other) | THMAP_LEAF_BIT;
target = THMAP_GETOFF(thmap, leaf) | THMAP_LEAF_BIT;