Lambda Types: Version of nodejs (w/o version suffix)?

[lebogg]

Hello,

I have some questions regarding the version of the lambda type const `RuntimeNodejs Runtime = "nodejs"

aws-sdk-go-v2/service/lambda/types/enums.go

Lines 337 to 340 in 24a9fca

	// Enum values for Runtime
	const (
	RuntimeNodejs Runtime = "nodejs"
	RuntimeNodejs43 Runtime = "nodejs4.3"

1. Why is there a general lambda runtime without a version suffix in the first place? When to expect retrieving a lambda function's FunctionConfiguration which has this runtime attached?
2. Why the other languages, e.g. java, don't have a general runtime enum value without a version?
3. Why are the constants not used in the function below? Are they used somewhere besides the documentation?

   aws-sdk-go-v2/service/lambda/types/enums.go

   Line 375 in 24a9fca

   func (Runtime) Values() []Runtime {