Change Type{Ref{T}} to Type{<:Ref{T}} (#26364)

Author: favba

base/refpointer.jl

@@ -33,7 +33,7 @@ end
 
 ### General Methods for Ref{T} type
 
-eltype(x::Type{Ref{T}}) where {T} = T
+eltype(x::Type{<:Ref{T}}) where {T} = @isdefined(T) ? T : Any
 convert(::Type{Ref{T}}, x::Ref{T}) where {T} = x
 
 # create Ref objects for general object conversion

test/core.jl

@@ -6010,3 +6010,6 @@ g25907a(x) = x[1]::Integer
 @test g25907a(Union{Int, UInt, Nothing}[1]) === 1
 g25907b(x) = x[1]::Complex
 @test g25907b(Union{Complex{Int}, Complex{UInt}, Nothing}[1im]) === 1im
+
+#issue #26363
+@test eltype(Ref(Float64(1))) === Float64