Resolve strings that are integers in Fn::Cidr

src/cfnlint/rules/functions/Cidr.py

@@ -74,6 +74,11 @@ def check_ip_block(self, value, path):
     def check_count(self, value, path):
         matches = []
         count_parameters = []
+        if isinstance(value, str):
+            try:
+                value = int(value)
+            except Exception:  # pylint: disable=broad-exception-caught
+                pass
         if isinstance(value, dict):
             if len(value) == 1:
                 for index_key, index_value in value.items():
@@ -116,6 +121,11 @@ def check_count(self, value, path):
     def check_size_mask(self, value, path):
         matches = []
         size_mask_parameters = []
+        if isinstance(value, str):
+            try:
+                value = int(value)
+            except Exception:  # pylint: disable=broad-exception-caught
+                pass
         if isinstance(value, dict):
             if len(value) == 1:
                 for index_key, index_value in value.items():

test/fixtures/templates/good/functions/cidr.yaml

@@ -63,8 +63,8 @@ Resources:
                       - 8
                 - 4
                 - 6
-            - 2
-            - 4
+            - "2"
+            - "4"
         VpcId: 'vpc-123456'
   PublicSubnet1:
     Type: AWS::EC2::Subnet