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Suggestion
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    Resolution: Unresolved
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P3: Somewhat important
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    None
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    6.8
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    None
 
`QJsonDocument::fromJson()` requires a `QByteArray` as the data to parse.
Allowing a `QIODevice` would avoid obliging the caller to read and story a copy of the data.
Incremental parsing is more memory-efficient.
Noticed while reviewing the fix for QTBUG-127011.
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QTBUG-129710 Adding QJsonStreamWriter and QJsonStreamReader + Simplifying QCborStreamReader and QCborStreamWriter for QVariant Support
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 - Open
 
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