k5_json_bool_value
int k5_json_bool_value(k5_json_bool bval);
creds->is_skey = k5_json_bool_value(b);
cred->default_identity = k5_json_bool_value(b);
cred->iakerb_mech = k5_json_bool_value(b);
cred->have_tgt = k5_json_bool_value(b);
k5_buf_add(buf, k5_json_bool_value(val) ? "true" : "false");
check(k5_json_bool_value(v), "fmt array[2] value");