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Federico Mena Quintero authored
This has a Data associated type, which is passed to parse(&str, data) -> Result<> We'll use that Data to pass RsvgLength's auxiliary data for parsing. Hopefully this way we can have a unified way to parse attribute values from strings, without having exceptions just because: a) RsvgLength needs to know the direction upon parsing/construction; b) We can't impl FromStr for cairo::Matrix because they both come from extern traits.
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