features.api.php says

function hook_field_default_fields_alter(&$fields)

although it is actually

hook_field_default_field_bases_alter(&$fields)
and
hook_field_default_field_instances_alter(&$fields)

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djdevin’s picture

djdevin
Location Philadelphia
CreditAttribution: djdevin commented
Status: Active » Closed (duplicate)
Related issues: +#2085159: Document hook_field_default_field_instances_alter/hook_field_default_field_bases_alter(