`H5P_SET_BTREE_RATIOS` sets the B-tree split ratios for a dataset transfer property list. The split ratios determine what percent of children go in the first node when a node splits.
The ratio `left` is used when the splitting node is the left-most node at its level in the tree; the ratio `right` is used when the splitting node is the right-most node at its level; and the ratio `middle` is used for all other cases. A node which is the only node at its level in the tree uses the ratio `right` when it splits. All ratios are real numbers between 0 and 1, inclusive. |