code: public Number getAndDecryptNumber(String name, String providerName) throws Exception {
          return (Number) getAndDecrypt(name, providerName);
      }
docs: Retrieves the decrypted value from the field name and casts it to {@link Number}.
  
  Note: Use of the Field Level Encryption functionality provided in the
  com.couchbase.client.encryption namespace provided by Couchbase is
  subject to the Couchbase Inc. Enterprise Subscription License Agreement
  at https://www.couchbase.com/ESLA-11132015.
  
  @param name the name of the field.
  @param providerName the crypto provider name for decryption
  @return the result or null if it does not exist.