Damn 🙂

> Map m = [:]
> m in Serializable

Result: true

Still interesting that it prefers

Serializable

over

Map

though

That is also true.. It would be interesting to know what Java would have done

image.png

I cannot try at the moment, does it have the same behaviour?

Just look at the screenshot

Got it

I'd have to look at the distance algorithm. I also wonder whether using

LinkedHashMap

would be a workaround for you? In any case, always feel free to create an issue and we can always close once we have confirmed behavior - that acts as extra information for future folks who stumble along the same path.

As it is different from Java behavior and Groovy targets to be "the Java scripting language", I'd tend to agree that the behavior is not correct. 🙂 If the method receives

LinkedHashMap

instead of

Map

it is indeed selected also by Groovy.

It is not as simple as doing exactly what Java does. Groovy supports multi-methods. It selects the best matching method based on actual runtime time.

I've opened a jira issue: https://issues.apache.org/jira/browse/GROOVY-11931