Weird data type issue

Serverless Framework
1

I am out of ideas on this one.

CREATE_FAILED: VerdaccioTaskDef (AWS::ECS::TaskDefinition)
Resource handler returned message: "Model validation failed (#/ContainerDefinitions/0/Memory: expected type: Number, found: String
#/ContainerDefinitions/0/Cpu: expected type: Number, found: String
#/ContainerDefinitions/0/Essential: expected type: Boolean, found: String
#/ContainerDefinitions/0/PortMappings/0/HostPort: expected type: Number, found: String
#/ContainerDefinitions/0/PortMappings/0/ContainerPort: expected type: Number, found: String
#/EphemeralStorage/SizeInGiB: expected type: Number, found: String)" (RequestToken: 40e20ed9-5261-6a60-e3ca-59d4dfb4ab02, HandlerErrorCode: InvalidRequest)

Here is my yaml for the ECS Task Definition

VerdaccioTaskDef:
      Type: AWS::ECS::TaskDefinition
      Properties:
        ContainerDefinitions:
          - 
            Name: verdaccio-app
            Cpu: 512
            Memory: 0.5
            Image: 827047061928.dkr.ecr.eu-west-2.amazonaws.com/bpmg/myrepo:1
            PortMappings:
              - 
                ContainerPort: 4879
                HostPort: 4879
                Protocol: tcp
            Essential: true
        ExecutionRoleArn: 
          Fn::GetAtt: [ ExecutionRole, Arn ]
        Family: 
          Fn::Join:
            - ""
            - - ${self:service}-family
        NetworkMode: awsvpc
        RuntimePlatform:
          OperatingSystemFamily: Linux
        RequiresCompatibilities: 
          - FARGATE
        Tags:
          - Key: name
            Value: 'Software Tooling'
        TaskRoleArn: 
          Fn::GetAtt: [ TaskRole, Arn ]
        EphemeralStorage:
          SizeInGiB: 5

I have read elsewhere that badly formed YAML higher up the document can cause CloudFormation to report errors erroneously.

Can someone please check over my task def and see if I’ve done anything wrong?