Microphone resource not released after stopping

[Destaq]

Even after we run recorder.stop(), there is still a little microphone icon in the tab / corner of the screen that is using audio-recorder-polyfill.

This is not desirable, as it can prevent other usages of the microphone, mess with the audio being played to headphones, give the user a sense of unease, etc.

For a minimal reproducible example, consider this CodePen (not mine). Notice that even after "stopping" has been logged, and the recorder has been stopped, the microphone has still not been released (as evidenced by the browser tab).

Is there a way around this or fix that could be implemented to better emulate the behavior of the native MediaRecorder, which has this "microphone in-use" signal terminate after a call to recorder.stop()?