RFC9586 UIDONLY support #366
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This is accomplished by making UIDFetchData subclass FetchData. I instinctively prefer to extact a module or a shared superclass and put all of the accessor methods on that. I did it this way in order to preserve the attribute accessor rdoc on FetchData. But it feels wrong to me that UIDFetchData is subclassing FetchData: * It's a small violation of Liskov's Substitution Principle, for #seqno (and, to a lesser extent, #uid). * Any case statements or pattern matching that are looking for FetchData will also match UIDFetchData, which may not be correct. It also complicates matching only UIDFetchData, because you need to ensure that when/in UIDFetchData comes before any when/in FetchData. On the other hand, it's probably a good thing that FetchData#=== matches UIDFetchData too. Other than #seqno (which is prohibited by `UIDONLY`) any code that works for FetchData today should work with UIDFetchData.
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This way, we can get the correct Struct field names for both classes, without needing to undef, alias, etc. It also fixes Struct methods like `to_h` and `deconstruct_keys`.
This reduces duplication between `fetch_internal` and `store_internal`.
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nevans
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Jan 3, 2025
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AKA "UI donly", apparently.