diff --git a/manifests/ca.pp b/manifests/ca.pp
index c56618e..0306df5 100644
--- a/manifests/ca.pp
+++ b/manifests/ca.pp
@@ -34,19 +34,16 @@
 # }
 
 define ca_cert::ca (
-  $ca_text           = undef,
-  $source            = 'text',
-  $ensure            = 'trusted',
-  $verify_https_cert = true,
-  $checksum          = undef,
-  $ca_file_mode      = $ca_cert::params::ca_file_mode,
+  Optional[String] $ca_text  = undef,
+  String $source             = 'text',
+  String $ensure             = 'trusted',
+  Boolean $verify_https_cert = true,
+  Optional[String] $checksum = undef,
+  String $ca_file_mode       = $ca_cert::params::ca_file_mode,
 ) {
 
   include ::ca_cert::params
 
-  validate_string($source)
-  validate_bool($verify_https_cert)
-
   if ($ensure == 'trusted' or $ensure == 'distrusted') and $source == 'text' and !is_string($ca_text) {
     fail('ca_text is required if source is set to text')
   }
diff --git a/manifests/init.pp b/manifests/init.pp
index 47af1da..31138da 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -37,20 +37,17 @@
 # Phil Fenstermacher <phillip.fenstermacher@gmail.com>
 #
 class ca_cert (
-  $always_update_certs = false,
-  $purge_unmanaged_CAs = false,
-  $install_package     = true,
-  $ca_certs            = {},
-  $package_ensure      = present,
-  $package_name        = $ca_cert::params::package_name,
+  Boolean $always_update_certs = false,
+  Boolean $purge_unmanaged_CAs = false,
+  Boolean $install_package     = true,
+  Hash    $ca_certs            = {},
+  String  $package_ensure      = present,
+  String  $package_name        = $ca_cert::params::package_name,
 ) inherits ca_cert::params {
 
   include ::ca_cert::params
   include ::ca_cert::update
 
-  validate_bool($always_update_certs)
-  validate_hash($ca_certs)
-
   if $always_update_certs == true {
     Exec <| title=='ca_cert_update' |> {
       refreshonly => false,
diff --git a/spec/classes/ca_cert_spec.rb b/spec/classes/ca_cert_spec.rb
index 7628f2e..00b1317 100644
--- a/spec/classes/ca_cert_spec.rb
+++ b/spec/classes/ca_cert_spec.rb
@@ -30,7 +30,7 @@
     context "with purge_unmanaged_CAs set to true" do
       let :params do
         {
-          :purge_unmanaged_CAs => 'true',
+          :purge_unmanaged_CAs => true,
         }
       end
       it { is_expected.to contain_file("trusted_certs").with(
@@ -65,7 +65,7 @@
     context "with purge_unmanaged_CAs set to true" do
       let :params do
         {
-          :purge_unmanaged_CAs => 'true',
+          :purge_unmanaged_CAs => true,
         }
       end
       it { is_expected.to contain_file("trusted_certs").with(
@@ -102,7 +102,7 @@
       context "with purge_unmanaged_CAs set to true" do
         let :params do
           {
-            :purge_unmanaged_CAs => 'true',
+            :purge_unmanaged_CAs => true,
           }
         end
         it { is_expected.to contain_file("trusted_certs").with(
@@ -139,7 +139,7 @@
     context "with purge_unmanaged_CAs set to true" do
       let :params do
         {
-          :purge_unmanaged_CAs => 'true',
+          :purge_unmanaged_CAs => true,
         }
       end
       it { is_expected.to contain_file("trusted_certs").with(