Optimise pyo3 use #16
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While this has not been profiled, it seems rather unlikely that the python implementation uses the same allocator as Rust (whether system or other). This means *returning* a `String` is an extra allocation as that will need to be copied again to a `PyString` on the ouput. Which is just dumb. Copy the internal `Cow` directly to a `PyString` on output. On input, a `String` is necessary as there's no way to lifetime properly from Python, so the extractors need to be `'static`.
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While this has not been profiled, it seems rather unlikely that the python implementation uses the same allocator as Rust (whether system or other). This means returning a
Stringis an extra allocation as that will need to be copied again to aPyStringon the ouput. Which is just dumb.Copy the internal
Cowdirectly to aPyStringon output. On input, aStringis necessary as there's no way to lifetime properly from Python, so the extractors need to be'static.