If you wouldn't have written the library if it weren't for your job, and you use the library to get your job done... it doesn't really matter if it's open sourc

If you wouldn't have written the library if it weren't for your job, and you use the library to get your job done... it doesn't really matter if it's open source. If you're in a jurisdiction and under an employment contract where your closed-source code is owned by the company, your equivalent open-source code is too. If we're talking about hobby projects, that's different, but it seems from this tweet that this is something that could have been written internally as part of someone's job and never open-sourced, right?