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This is the same problem that exists with null etc. A bug causes an unexpected value (null/undefined/NaN/etc.) Ideally you crash immediately; then the traceback shows where the problem is. But often, that value propagates through the system and causes distant, confusing failures.
At least TypeScript can help protect you from null & undefined. Nothing can save you from NaN
Ha... I saw this tweet come in as I was searching for "can TypeScript exclude NaN from a number value's type?" The answer is "no", but there's an open issue for it!https://github.com/Microsoft/TypeScript/issues/28682 …
I still think it's amusing that the type of "not a number" is "number"
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