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GA4 text custom dimensions do not capture numeric params (step showed as "(not set)"). Log step as String and add a readable step_name so the onboarding drop-off is queryable. Registered source/environment/step_name custom dimensions in the GA4 property to match. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Df9kZEUMXPLn4Kb9Zx1f5o