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Nice! That's (seems) so simple yet also so very effective. Shouldn't other memory-managed languages be able to profit from this as well?

It’s a very well known pattern, as someone else mentioned it’s used in CPP in smallstring, Rust smallvec, C usually hand rolled etc.

C# has `stackalloc`

But that requires an explicit declaration and isn't done automatically under the hood, or am I missing something?