Deleting Lambda Doesn't Reset Version Number - amazon-web-services

Question

I'm working on a CloudFormation template and noticed an intricacy with Lambda that's new for me. Here's a snippet:
VersionLambdaRandom:
Type: AWS::Lambda::Version
Properties:
Description: Version testing.
FunctionName: !Sub "arn:${AWS::Partition}:lambda:${AWS::Region}:${AWS::AccountId}:function:${LambdaRandom}"
DependsOn: LambdaRandom
AliasLambdaRandom:
Type: AWS::Lambda::Alias
Properties:
FunctionName: !Sub "arn:${AWS::Partition}:lambda:${AWS::Region}:${AWS::AccountId}:function:${LambdaRandom}"
FunctionVersion: '1'
Name: TestDeploymentAlias
DependsOn:
- LambdaRandom
- VersionLambdaRandom
In the process of spinning this stack up and down, which deletes both the Version and Alias along with the Random Lambda that is not included here, I've noticed the version number doesn't reset when I create the stack again. Essentially, I'll create the stack again and will get a failure during the deployment along the lines of:
Function not found: arn:aws:lambda:us-east-1:<Acct#>:function:RandomLambdaFunction:1 (Service: AWSLambdaInternal; Status Code: 404; Error Code: ResourceNotFoundException)
Looking in the console, I can see a version of the newly created function was created successfully; however, it's now at version 2 rather than version 1. This seems like strange behavior to me since I completely deleted the stack, which includes deleting the lambda and the version.
What can I do to ensure the version I create when creating a stack always remains at one, besides switching the function name each time?

Answer 1

Lambda versions are immutable. That's the entire point of versioning - you can't change them once published, which includes deleting them. You have to delete your function as well to get read of its versions.