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nextInt

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  the lexer can always tell with fixed lookahead whether `a-b` is three tokens or one
How does that work? It doesn't seem obvious to me?

I also wonder what approaches other languages have taken since I haven't seen dashed keywords in any of the other big languages.

I attended a talk by Coinbase. They get A LOT of fraudulent activity (both high end and amateur). They have like 7-8 employees who handle all the manual aspects of user verification. So they have to rely heavily on automated solutions. I have never used them so I don't know how often they flag false positives but based on that talk I would at least qualify the statement with "it's a hard problem!"