Unseparated literal suffix Closes #7658 Since `literal_suffix` style is opinionated, we should disable by default and only enforce if it's stated as so. changelog: [`unseparated_literal_suffix`] is renamed to `literal_suffix`, adds a new configuration `literal-suffix-style` to enforce a certain style writing literal_suffix. Possible values for `literal-suffix-style`: `"separated"`, `"unseparated"`