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In which data structures? For example in CL hashes use multiple returns so in 99% of cases you can just not care, and when you do care about the difference you just check the second return value.

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I've run into issues when interfacing databases and writing interpreters, and probably more that I've forgotten.

They're just minor culture clashes that add up...

I like the way CL does things but it makes dealing with JSON occasionally annoying.

Do you mean, for example, a null node versus a missing node?

I mean distinguishing between `null`, `false`, and `[]` on the JSON side. Most JSON libraries for CL by default parse them all as `nil`. (ST-JSON excepted.)

I guess that means you can't generate false and [] either?

So this would be a good example the culture clashes I mentioned, handled badly.

Yes, I think the two return values convention in CL mostly makes this a non-issue.

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