Is there a particular reason why

Closeable

interface and use extension is not in the common stdlib?

I guess it might an overlook. There's #stdlib channel.

Will shamelessly cross-post 😈

Because it's very JVM specific I think.

Since kotlin doesn't have destructors, this seems to be the next best thing. Also there are closeable resources in any platform.

When I say it's a very JVM thing, I mean it's an API that comes straight from the JVM, and the

close

function can throw

IOException

, again, a very JVM thing (nowhere to be found in platforms supported by Kotlin/Native for example. API-wise, it's a bit complicated to support that forever I think, because it might not be the best abstraction for resource releasing, and Kotlin might lack the facilities or consistency across supported platforms (i.e. shared XOR mutable on native for now) to allow for a better solution.

one more issue is that this interface wouldn’t be used on stdlib itself. so it will be just a convention Though, I think it’s reasonable to add it, but again, it opens other questions, like should

close()

be suspend and how it should work with java Closable/AutoClosable