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Quoting @yched from:
even though the recent new field types (url, mail - soon date and entity_reference ?) have been added as submodules of /core/modules/field (next to the existing text, number, etc...), it would be good to get MAINTAINERS.txt entries for those, and not assume they are maintained by the Field API team :-)
or we're going to hit the CCK effect (field modules get neglected because maintaining them all + the API itself is too big of a task).
Field type modules + maintainer candidates
|Entity Reference||@Amitaibu, @amateescu|
|Phone||@nick_schuch, @tim-e, @cweagans|
|Taxonomy||@xjm, @catch, @bangpound|