What is discoverable_by_email for?


What is the purpose of the field called discoverable_by_email on the GET account/settings request (https://dev.twitter.com/docs/api/1.1/get/account/settings)?

It suggests to me that one could look up a Twitter ID by email address, but how would I lookup by email with any of user retrieval methods (listed below)?

GET users/lookup (https://dev.twitter.com/docs/api/1.1/get/users/lookup)
GET users/show (https://dev.twitter.com/docs/api/1.1/get/users/show)
GET users/search (https://dev.twitter.com/docs/api/1.1/get/users/search)