Equivalent to absl::StrAppend

I'm building up a string by appending numbers, but my current code has a bunch of wasteful intermediate allocations, specifically:


The equivalent absl::StrAppend API uses the string's buffer directly and avoids the intermediate allocation.

If n is itself an &str, then you can simply do s.push_str(n).

String implements fmt::Write, so you can use write!(&mut s, "{}", n) - this should avoid the excess allocations.


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