Handling multiple `name` alternatives

[ReubenJ]

I have a set of JSON files with some inconsistent keys. It'd be handy to be able to specify multiple alternative names for a field à la

struct SomeStruct
    my_field & (json=(name=("MyField", "myfield", "field_my")))
end

Is there a way to do this already? If not, is it within the scope of the package to support something like this?

On second thought, maybe this is better suited for the JSON repo...

[ReubenJ]

Looks like this just needs an extra method for keyeq.

Either:

keyeq(a, b::Tuple) = any(keyeq(a), b)

or tighten the type bounds for the fallback method for individual names, and use the untyped method for the many-name case:

keyeq(a::Number, b::Number) = isequal(a, b)
keyeq(a, b) = any(keyeq(a), b)

Any preference @quinnj? I can open a PR if you're on board.