table_to_bkey
table_to_bkey(t, j) <= k)
k = table_to_bkey(t, j - 1);
for (k = table_to_bkey(t, t->size - 1);
if (bkey_cmp(table_to_bkey(t, m), search) > 0)
table_to_bkey(t, li),
ri < t->size ? table_to_bkey(t, ri) : bset_bkey_last(t->data)