WP_User search by keyword – lacking wildcard in sql query

WP 3.8.1

Trying to do a keyword search for user, but the SQL has no wildcards in the LIKE statements in the WHERE part. Is this a known bug?

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` [query_fields] => DISTINCT SQL_CALC_FOUND_ROWS wp_users.*
[query_from] => FROM wp_users INNER JOIN wp_usermeta ON (wp_users.ID = wp_usermeta.user_id)
INNER JOIN wp_usermeta AS mt1 ON (wp_users.ID = mt1.user_id)
[query_where] => WHERE 1=1 AND (user_login LIKE ‘a’ OR user_nicename LIKE ‘a’) AND ( (wp_usermeta.meta_key = ‘wp_capabilities’ AND CAST(wp_usermeta.meta_value AS CHAR) LIKE ‘%gigrobot\\_booker%’)
OR (mt1.meta_key = ‘wp_capabilities’ AND CAST(mt1.meta_value AS CHAR) LIKE ‘%gigrobot\\_purchaser%’) )
[query_orderby] => ORDER BY display_name ASC
[query_limit] => `