It's wonderful when software just works™ with Unicode. Sadly you still can't always take it for granted with a new app.
miniblog.
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Since the Netflix API shut down, I don't take APIs for granted. Delighted to learn that eBay's API is pretty featureful.
Sorting, trigonometry, filesystem access, HTTP. All these libraries I took for granted until I created a programming language. Nontrivial!