Always use "--" in "dom parse" when document is interpolated
This is a safety measure to make sure that the document parsed is never confused with an option, when the document starts with a "-". In the best case, the error message provided by "dom parse" might be misleading. This might be a problem for user contributed documents (passed as variables, or return values from functions).
The double dash is supported in tdom since version 0.9.0.
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