more specific signature

Author: dkarrasch

stdlib/LinearAlgebra/src/generic.jl

@@ -903,8 +903,8 @@ function dot(x, y) # arbitrary iterables
 end
 
 dot(x::Number, y::Number) = conj(x) * y
-dot(::Any, ::Missing) = missing
-dot(::Missing, ::Any) = missing
+dot(::Number, ::Missing) = missing
+dot(::Missing, ::Number) = missing
 dot(::Missing, ::Missing) = missing
 
 function dot(x::AbstractArray, y::AbstractArray)