[general] Some suggestions on tar_rep()

[psychelzh]

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Description

Thanks for adding tar_rep() and tar_rep2(), which are very convenient. But I found several things not so well-fitted in my practice:

1. Is it possible to store tar_rep, tar_batch, and tar_seed in meta only? Or store them as attributes of the generated objects?
2. If storing them is a must-have, I am wondering if we should use "." prefix to minimize conflicts with user's data?
3. The documentation does not mention the store tar_seed, which should be a small typo to fix.

[psychelzh]

The first needs some considerations when the generated objects are NULL.

[wlandau]

Is it possible to store tar_rep, tar_batch, and tar_seed in meta only? Or store them as attributes of the generated objects?

I prefer these to be explicit so users can more easily find them.

If storing them is a must-have, I am wondering if we should use "." prefix to minimize conflicts with user's data?

Maybe the names should have started with "." from the beginning, but at this point that would be a breaking change.

The documentation does not mention the store tar_seed, which should be a small typo to fix.

Added in 0d94747.