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Additional flags are comma separated list preceeded by `-` or `+`. Before: ```sh $ ruby --dump=insns+without_opt ``` After: ```sh $ ruby --dump=insns-opt,-optimize ``` At the same time, `parsetree_with_comment` is split to `parsetree` option and additional `comment` flag. Before: ```sh $ ruby --dump=parsetree_with_comment ``` After: ```sh $ ruby --dump=parsetree,+comment ``` Also flags can be separate `--dump`. ```sh $ ruby --dump=parsetree --dump=+comment --dump=+error_tolerant ``` Ineffective flags are ignored silently. ```sh $ ruby --dump=parsetree --dump=+comment --dump=+error_tolerant ```