diff --git a/src/binary_ops.jl b/src/binary_ops.jl
index 4c84c87..7677b7c 100644
--- a/src/binary_ops.jl
+++ b/src/binary_ops.jl
@@ -28,20 +28,22 @@ end
 
 
 for OP in (:(<), :(<=), :(>=), :(>), :(!=), :(==), :isless, :isequal)
+    for SI in (SafeSigned, SafeUnsigned, SafeInteger)
+        @eval begin
+            @inline function $OP(x::T, y::T) where T<: $SI
+                ix = baseint(x)
+                iy = baseint(y)
+                result = $OP(ix, iy)
+                return safeint(result)
+            end
+
+            @inline function $OP(x::T1, y::T2) where {T1<:$SI, T2<: $SI}
+                xx, yy = promote(x, y)
+                return $OP(xx, yy)
+            end
+        end
+    end
     @eval begin
-
-       @inline function $OP(x::T, y::T) where T<:SafeInteger
-           ix = baseint(x)
-           iy = baseint(y)
-           result = $OP(ix, iy)
-           return safeint(result)
-       end
-
-       @inline function $OP(x::T1, y::T2) where {T1<:SafeInteger, T2<:SafeInteger}
-           xx, yy = promote(x, y)
-           return $OP(xx, yy)
-       end
-
        @inline function $OP(x::T1, y::T2) where {T1<:SafeSigned, T2<:Signed}
            xx, yy = promote(x, y)
            return $OP(xx, yy)
@@ -75,7 +77,11 @@ for OP in (:(<), :(<=), :(>=), :(>), :(!=), :(==), :isless, :isequal)
            xx, yy = promote(x, y)
            return $OP(xx, yy)
        end
-   end
+       @inline function $OP(x::T1, y::T2) where {T1<:SafeInteger, T2<:Integer}
+           xx, yy = promote(x, y)
+           return $OP(xx, yy)
+       end
+    end
 end
 
 
diff --git a/src/int_ops.jl b/src/int_ops.jl
index 8a2cb0e..2fc987f 100644
--- a/src/int_ops.jl
+++ b/src/int_ops.jl
@@ -55,6 +55,10 @@ end
   return safeint(baseint( signbit(y) ? -abs(x) : abs(x) ))
 end  
 @inline copysign(x::T, y::T) where T<:SafeUnsigned = x
+@inline copysign(x::SafeSigned, y::Float16) = safeint( copysign(baseint(x), y) )
+@inline copysign(x::SafeSigned, y::Float32) = safeint( copysign(baseint(x), y) )
+@inline copysign(x::SafeSigned, y::Float64) = safeint( copysign(baseint(x), y) )
+@inline copysign(x::SafeSigned, y::Signed) = safeint( copysign(baseint(x), y) )
 
 @inline function flipsign(x::T, y::T) where T<:SafeSigned
   return safeint(baseint( signbit(y) ? -(x) : x ))
diff --git a/src/promote.jl b/src/promote.jl
index 2477cf6..6b90f1d 100644
--- a/src/promote.jl
+++ b/src/promote.jl
@@ -5,10 +5,14 @@ promote_rule(::Type{S}, ::Type{T}) where S<:SafeSigned   where T<:SafeUnsigned =
 promote_rule(::Type{S}, ::Type{T}) where S<:SafeUnsigned where T<:SafeUnsigned =
     safeint(promote_type(baseint(S), baseint(T)))
 
-promote_rule(::Type{S}, ::Type{T}) where S<:SafeSigned   where T<:Signed   = S
-promote_rule(::Type{S}, ::Type{T}) where S<:SafeSigned   where T<:Unsigned = S
-promote_rule(::Type{S}, ::Type{T}) where S<:SafeUnsigned where T<:Signed   = S
-promote_rule(::Type{S}, ::Type{T}) where S<:SafeUnsigned where T<:Unsigned = S
+promote_rule(::Type{S}, ::Type{T}) where S<:SafeSigned   where T<:Signed   =
+    T <: SafeInteger ? Base.Bottom : S
+promote_rule(::Type{S}, ::Type{T}) where S<:SafeSigned   where T<:Unsigned =
+    T <: SafeInteger ? Base.Bottom : S
+promote_rule(::Type{S}, ::Type{T}) where S<:SafeUnsigned where T<:Signed   =
+    T <: SafeInteger ? Base.Bottom : S
+promote_rule(::Type{S}, ::Type{T}) where S<:SafeUnsigned where T<:Unsigned =
+    T <: SafeInteger ? Base.Bottom : S
 
 promote_rule(::Type{S}, ::Type{T}) where S<:SafeSigned   where T<:Base.IEEEFloat = T
 promote_rule(::Type{S}, ::Type{T}) where S<:SafeUnsigned where T<:Base.IEEEFloat = T
diff --git a/src/type.jl b/src/type.jl
index 1bf350f..3a00056 100644
--- a/src/type.jl
+++ b/src/type.jl
@@ -1,6 +1,6 @@
-abstract type SafeInteger  <: Integer     end
-abstract type SafeUnsigned <: SafeInteger end
-abstract type SafeSigned   <: SafeInteger end
+abstract type SafeUnsigned <: Unsigned end
+abstract type SafeSigned <: Signed end
+const SafeInteger = Union{SafeUnsigned, SafeSigned}
 
 primitive type SafeInt8    <: SafeSigned     8 end
 primitive type SafeInt16   <: SafeSigned    16 end