How to get the type of $null?

I'd like to retrieve the eventual return type of the function, e.g. the
thing that determines whether $null maps to 0 or nothing.

I tried decltype($null) but that doesn't work when $null is nothing, e.g.
decltype() is ill-formed.

I'm trying to call a sub-typemap within a lambda and I need the return type
of the lambda to work out. I could make it work with just a scope block
instead of a lambda, but that's not as clean.

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