Some attributes are special and recognized by Hull. When we see them, we'll apply processing

For Users, they are the following:

• email - Used for Identity resolution
• name - Generated automatically from first_name and last_name
• created_at - Auto-generated if absent
• last_known_ip - Auto-computed - avoid sending values for this attribute. Will be overwritten
• last_seen_at - Auto-computed - avoid sending values for this attribute. Will be overwritten
• last_contacted_at - Auto-computed - avoid sending values for this attribute. Will be overwritten
• uids - Auto-computed - avoid sending values for this attribute. Will be overwritten
• domain: will be normalized and auto-filled from email if present. You can send your own values to overwrite
• contact_email - Ignored / Internal use
• image - Stored at top level instead of the traits group
• picture - Stored at top level instead of the traits group
• phone - Stored at top level instead of the traits group
• address - Stored at top level instead of the traits group
• description - Stored at top level instead of the traits group
• accepts_marketing - Has to be a boolean value
• approved - Has to be a boolean value