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Result
Method
This conservative formatter normalizes CRLF and CR line endings to LF, removes trailing whitespace, collapses repeated blank lines, and adds one final newline. It deliberately preserves leading spaces because changing YAML indentation can change meaning.
Limits and assumptions
This is not a full YAML parser, schema validator, serializer, or repair engine. Leading tab indentation is rejected as ambiguous. Review semantic YAML correctness with the consuming application.