flush() never called in standard output stream specified for the context

[nsoubelet]

Version: org.graalvm.python:python-language:23.1.0

Hello, just wanted to report something really simple: when an output stream is specified via Context.newBuilder().out(Some) the method flush() is never called when, for example, doing a print('Hello Python!');.

It works well in other languages, like js.

Not sure whether this is an error or it does work like that by design.

Thanks