Use `Cow::Borrowed` for the value of string-like tokens without escapes or NUL.
Use `Cow::Borrowed` for the value of string-like tokens without escapes or NUL.

tempbottle/rust-cssparser,disjukr/rust-cssparser,notriddle/rust-cssparser,tempbottle/rust-cssparser,notriddle/rust-cssparser,servo/rust-cssparser,servo/rust-cssparser,disjukr/rust-cssparser,frewsxcv/rust-cssparser,frewsxcv/rust-cssparser