text: const _set = (v) => v.toLowerCase();
  const _validate = (v) => /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(v);
  
  const Field = {
    type: String
  , set: _set
  , validate: [ _validate, 'Email {{VALUE}} inválido!' ]
  //, required: true
  , index: true
  }
  
  module.exports = Field;
  