> (BMP subset of) UTF-8 The hell of it is, UTF-8 expands gracefully to the astral planes; it's UTF-16 that you need to worry about, either because the people d

> (BMP subset of) UTF-8 The hell of it is, UTF-8 expands gracefully to the astral planes; it's UTF-16 that you need to worry about, either because the people designing the software never heard of surrogate pairs, in which case they didn't give you UTF-16 but UCS-2, or implemented surrogate pairs incorrectly.