GIN over array of ENUMs

I wish to create this data structure but GIN does not currently support an
array of ENUM. Is intarray() a good place to look into adding ENUM support
or is there already an operator class for working supports enums that I
simply don't see at the moment.

This is being done as an alternative to a very large number of boolean
columns which are rarely true (under 1%).

CREATE TYPE feature AS ENUM ('item1', 'item2', 'item3');
CREATE TABLE test (id serial PRIMARY KEY, features feature[]);

CREATE INDEX test_features_idx ON test USING GIN (features, id);

ERROR: data type feature[] has no default operator class for access method
"gin"
HINT: You must specify an operator class for the index or define a default
operator class for the data type.

Thanks in advance,

Rod