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Seems like the justification would be to keep the type information when going back and forth to Ion. More like "multiple nullable types" instead of "multiple types of null"

userBirthDay: null <-- ok, but what type is it? String? Int? Timestamp?

userBirthDay: null.timestamp <-- ok, it's a timestamp typed variable, but we don't know the value. Yay, happy programmer.

My guess is buffer size calculations.

typed nulls good

Sounds like the grug brained developer speaking... Hi! ;)