What if the leaves has the same content?

[Shawn-Huang-Tron]

Hi, I have seen this two method:
https://github.com/cbergoon/merkletree/blob/master/merkle_tree.go#L115
https://github.com/cbergoon/merkletree/blob/master/merkle_tree.go#L265
What if we have same contents in two different leaves? Will it result in the wrong result?

[patrickmao1]

second this... i think this lib needs another method for generating merkle proofs by specifying leaf index. Otherwise this lib is unusable for sparse merkle trees where many leaf nodes can be empty, and we cannot generate non-inclusion merkle paths