Personally, if you can avoid ifdef blocks and just make code that works on both platforms that's best. If it's unavoidable then it's unavoidable though. I definitely think the code looks best without 10 million ifdef blocks all over it /glare bot code.
I can't imagine there are too many changes that will break 32 bit compatibility. Maybe a few but we've got enough 32 bit developers to catch it pretty quickly.
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