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I remember reading (decades ago) an extensive article in Software Practice and Experience reaching the same conclusion.

Or like Python shows there, 1.25+k which can be better (faster growth and less memory wasted) than both

1.25 of what? Do you mean 2.25*k == 9*k/4.

They say 1.25+k, in this context k will be some constant, suppose it's 16 bytes

Thus you might see a curve like 13, 32, 56, 86 - this curve is aggressive to start but then much gentler. Because it's so gentle it gets the re-use upside for medium sized allocations but it incurs a lot more copying, I can imagine in Python that might be a good trade.

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