julia

5d1e1d07 - Replace Nullable{T} with Union{T, Void} or Union{Some{T}, Void} (#23642)

Replace Nullable{T} with Union{T, Void} or Union{Some{T}, Void} (#23642) Also add coalesce() function to return first non-nothing value and unwrap Some objects. Use the notnothing() function internally where it makes sense to assert that the result is different from nothing. Use custom MaybeValue wrapper for ProductIterator to work around a performance regression due to type instability (information about whether a value is present or not is carried separately).