The Debug trait implementation might be better if it follows the format discussed in FenwickTree #145 to keep things consistent.

Also, personally, I feel that it might be a bit confusing for users if the fmt function does not display the struct name.

I'd like to propose a few improvements to the current Debug implementation for LazySegtree.

Currently, the fields n, size, and log are not displayed. I think it would be better to include them in the output as well.

Additionally, since the current implementation uses tabs and newlines manually rather than relying on helper methods like debug_struct, the output remains the same even when using the alternate flag ({:#?}).
To address this, I would like to update the implementation to use helpers such as debug_struct to provide proper formatting and alternate flag support.

More specifically, I’m thinking of displaying d and lz separately, formatting each in a way similar to a two-dimensional vector grouped by segment length.

To help clarify what I have in mind, I’m also considering opening a draft PR with a sample implementation.