cedar-policy 4.10.0

Cedar is a language for defining permissions as policies, which describe who should have access to what.
Documentation 
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entity User;
action readWrite;
action read in [readWrite] appliesTo {
    principal: [User],
    resource: [User],
    context: {}
};
action write in [readWrite] appliesTo {
    principal: [User],
    resource: [User],
    context: {}
};