Use Numeric or Integer instead of Fixnum for Ruby 2.4.

Author: gkellogg

lib/json/ld/resource.rb

@@ -93,7 +93,7 @@ def initialize(node_definition, options = {})
 
     ##
     # Return a hash of this object, suitable for use by for ETag
-    # @return [Fixnum]
+    # @return [Integer]
     def hash
       self.deresolve.hash
     end

lib/json/ld/to_rdf.rb

@@ -23,7 +23,7 @@ def item_to_rdf(item, graph_name: nil, &block)
           # If value is true or false, then set value its canonical lexical form as defined in the section Data Round Tripping. If datatype is null, set it to xsd:boolean.
           value = value.to_s
           datatype ||= RDF::XSD.boolean.to_s
-        when Integer, Float, Fixnum
+        when Numeric
           # Otherwise, if value is a number, then set value to its canonical lexical form as defined in the section Data Round Tripping. If datatype is null, set it to either xsd:integer or xsd:double, depending on if the value contains a fractional and/or an exponential component.
           lit = RDF::Literal.new(value, canonicalize: true)
           value = lit.to_s

spec/resource_spec.rb

@@ -40,7 +40,7 @@
   end
 
   describe "#hash" do
-    specify {expect(subject.hash).to be_a(Fixnum)}
+    specify {expect(subject.hash).to be_a(Integer)}
 
     it "returns the hash of the attributes" do
       expect(subject.hash).to eq subject.deresolve.hash