How do I pass a boolean true value

[aymanosman]

Calling

(aws/ssm:get-parameter
 :name "FOO"
 :with-decryption t)

results in

The value of QURI.ENCODE::VALUE is T, which is not of type (OR
                                                            STRING
                                                            NUMBER
                                                            (SIMPLE-ARRAY
                                                             (UNSIGNED-BYTE
                                                              8)
                                                             (*))).

If I pass a non-boolean values, such as "1", I get an error that I'm not passing a boolean.