An unexpected fatal error in a forced downcast from a nil to an optional generic type T, e.g. T = String?.
- NOTE: Casting nil as Any before the forced downcast is a workaround to avoid the runtime fatal error. Perhaps this in itself is its own bug?
- NOTE: This is similar to a previously reported and resolved bug: https://bugs.swift.org/browse/SR-912 — in this case, the input type is Any and not Any?.