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Twitter does not allow SVGs to be used for twitter:image metadata (see https://developer.twitter.com/en/docs/twitter-for-websites/cards/overview/markup) so we should fall back to the site logo if the image option provided to `crawlable_meta_data` or SiteSetting.site_twitter_summary_large_image_url is an SVG, and do not add the meta tag for twitter:image at all if the site logo is an SVG.