Editor engagement experiments/Bucketing
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Viable bucketing criteria 
The following data points are cached and are therefore feasible for us to use as bucketing criteria for high-volume experiments. (Use of some of these data points may be restricted for extraneous reasons; their inclusion here reflects their viability from the perspective of engineering only.)
Items on the list correspond to columns on the MediaWiki user table.
Bucket Verification 
We should utilize a non-bucketing debug mode accessible via URL parameters (e.g. debug=true&exp=XYZ&bucket=ABC) to visualize a specific design/condition. Relying upon page refresh and cookie removal until being assigned to the correct bucket is problematic.