fix: Default-implement memorySize via Swift extension
#497
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Instead of re-implementing
memorySizein every_baseclass, I can provide a shared default-implementation for it using a Swift protocolextension.I found this out by accident by talking to ChatGPT about dynamic dispatch in Swift.
This is statically resolved at compile-time if it isn't overridden, so it's also more performant.
Warning
If anyone uses
memorySize, they just need to remove theoverridekeyword.