interpolation, which produced
invalid markup on ~80% of product pages: descriptions carry raw newlines, and
strip_tags returns an html_safe buffer so inch marks (9.5" L x 11.5" W) went
through unescaped and terminated the string early. Google discards a block it
cannot parse, so those pages showed no price, availability or review stars.
Build a Hash and let to_json do the escaping.
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