The 'LighthouseCategoryV5' schema has been updated with a new field 'categoryScoreDisplayMode'. This field provides guidance on whether a score should be rendered as a standard circular 'GAUGE' or as a 'FRACTION' (e.g., "3/5"). This is particularly useful for developers building custom dashboards or reporting tools that consume Lighthouse data via the API and want to match the official Lighthouse UI behavior.
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