fixup! fixup! Add support for literals

Author: vchuravy

src/literals.jl

@@ -5,6 +5,6 @@ Base.:(*)(x::Number, ::Type{Literal{T}}) where {T} = T(x)
 const i8 = Literal{Int8}
 const i16 = Literal{Int16}
 const i32 = Literal{Int32}
-const u8 = Literal{Int8}
-const u16 = Literal{Int16}
-const u32 = Literal{Int32}
+const u8 = Literal{UInt8}
+const u16 = Literal{UInt16}
+const u32 = Literal{UInt32}