Multi-line, indented .dxn rendering — Dextrin.encode/2's pretty: true opt, mix dextrin.format's --mode pretty, and mix dextrin.decode's default output (a CLI decode is a human reading the result, so encode/2's own single-line default isn't the right default there). --mode condense needs no separate implementation at all: it's exactly what Dextrin.encode/2/Dextrin.Text.Printer already produce with pretty: false (the default).

Comments cannot be preserved here, or by any formatter built on this library's decode-then-reprint approach: Dextrin.Text.Grammar's lexer folds #-comments into the same auto-spliced trivia as whitespace and discards them before the parser (and therefore any value) ever exists. There is no comment text left to put back by the time a value reaches this module. A genuine comment-preserving formatter would need a second, independent re-lexing pipeline that never goes through the value-producing parse at all — real, separate work, not a flag on this one.