Arguably, PSA: Julia is not at that stage of development anymore applies here. Union{...} has been a basic part of Julia’s syntax for more than 10 years now, is explicit and reasonably concise, and doesn’t seem to have been a major point of difficulty (no one has even aired a desire for an alternate syntax to my knowledge?). Adding an alternate syntax (especially if it involves changing operator precedence!) is probably not realistically on the table, even though it can be fun to think about.
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