TextDocument::parse reads a borrowed tree: names, bare words and strings without
escapes point into the body, keys are borrowed when they are /names, numbers parse from
the borrowed bytes, and dictionaries and arrays are moved into vectors of their exact size
when they close. The style and paragraph defaults are built once instead of per document.
parse_text_dict keeps its public TextValue result (the borrowed tree turned owned).
The old owning parser stays as a test-only oracle: a differential test compares both on
40 000 generated bodies (every key form the owned keys canonicalise, non-UTF-8 names,
escapes, unclosed strings, non-finite numbers), every cut of a realistic document and
nesting around the depth limit.
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