Inference fix

Author: N5N3

base/reducedim.jl

@@ -188,7 +188,7 @@ function reducedim_init(f::ExtremaMap, op::typeof(_extrema_rf), A::AbstractArray
         v0 = oftype(v0[1], Inf), oftype(v0[2], -Inf)
     elseif isunordered(v0[1])
         # v0 is missing or a third-party unordered value
-        T1, T2 = Tr.parameters
+        T1, T2 = Tr.parameters[1], Tr.parameters[2]
         # TODO: Some types, like BigInt, don't support typemin/typemax.
         # So a Matrix{Union{BigInt, Missing}} can still error here.
         v0 = typemax(nonmissingtype(T1)), typemin(nonmissingtype(T2))