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PNG window bits defaults to 9 instead of defaulting to 15 like in libpng. #777

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@domgetter

static const type default_value = 9;

The default window bits here should be 15 for a 32k window, to match libpng. Having it set to 9 makes compression much much slower for anyone who uses png_tag with write_view, and there is no stated reason for why this was set to 9.

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