pdf-lib is silently deleting characters from your users' data

I generate invoices in a Node serverless function with pdf-lib. It is a good library. It also quietly destroyed a client's company name, threw nothing, logged nothing, and produced a PDF that opened perfectly. The name was Łódź Sp. z o.o. The invoice said ód Sp. z o.o. Here is what is going on, because it will hit anyone generating documents from...