diff --git a/src/helpers.jl b/src/helpers.jl
index 0f06bb6d3..3f7998533 100644
--- a/src/helpers.jl
+++ b/src/helpers.jl
@@ -113,6 +113,10 @@ nonnumeric(x) = NonNumeric(x)
 
 Base.print(io::IO, n::NonNumeric) = print(io, n.x)
 Base.isless(n1::NonNumeric, n2::NonNumeric) = isless(n1.x, n2.x)
+Base.isless(n1::NonNumeric, n2) = isless(n1.x, n2)
+Base.isless(n1, n2::NonNumeric) = isless(n1, n2.x)
+Base.typemax(::Type{NonNumeric{T}}) where T = typemax(T)
+Base.typemin(::Type{NonNumeric{T}}) where T = typemin(T)
 
 struct Verbatim{T}
     x::T