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Adjust core::num::strconv to use fixed buffers, not heap allocated #2649

@graydon

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@graydon

Uint formatting was (for a time) using fixed-size buffers on the stack. It was changed to use variable sized heap buffers when merged with strconv. That path needs to be changed back to using stack buffers ("larger than the maximum formatted number size")

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    C-cleanupCategory: PRs that clean code up or issues documenting cleanup.E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.

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