fn parse_flexibility<'i, 't>(
context: &ParserContext<'_>,
input: &mut Parser<'i, 't>,
) -> Result<(NonNegativeNumber, Option<NonNegativeNumber>), ParseError<'i>>
fn parse_flexibility<'i, 't>(
context: &ParserContext<'_>,
input: &mut Parser<'i, 't>,
) -> Result<(NonNegativeNumber, Option<NonNegativeNumber>), ParseError<'i>>