[FEATURE] Support Insertion of Elements at End

[Rohan-GRH]

Hi!

Thanks for reviewing issues #9 and #10. As a non-native speaker, I did use LLMs to craft these issues, but they have been manually reviewed before reporting. I understand these issues may be controversial. That's why I would like to discuss them with you.

For the issue, could the documentation explicitly state that StackVec::insert intentionally requires index < len and does not support tail insertion at index == len, so users should call push for that case? I understand this is rather subtle. However, it would be better if there were no potential for misinterpretation. For context, Vec::insert allows 'index == len'. Thank you for your time!

[Alexhuszagh]

That's a feature I'd be amenable too for sure, however, I wanted to make it clear that these are not linked to security issues (in fact, being overly cautious is a protection against potential security issues), and this is a feature request. There's been a massive upsurge in LLM-generated security reports that are not actually security issues. While I greatly appreciate bug reports and feature requests, I expect them to be manually created to focus on the core issues rather than include extraneous, irrelevant information no matter what tool assistance is used.

Now that you, a human, have reviewed them and brought them down to the core issue (that is, a feature request) I'm more than happy to implement it.

[Rohan-GRH]

Got it, thanks! I’ll keep that in mind for future issues.