The Invisible Shopify Render Tax: How Unregistered Metafield Definitions Cost Us Three Days of 500s
A Shopify theme app extension returned HTTP 500 on every storefront page for three days. The root cause — `shop.metafields.*` reads inside a `target: body` block — blew past an undocumented Liquid complexity ceiling. Measurements, repro script, and what Shopify's docs don't say.
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