Literal::Decimal must turn Float values into string to avoid Argument error on BigDecimal.

Author: gkellogg

lib/rdf/model/literal/decimal.rb

@@ -22,8 +22,9 @@ def initialize(value, options = {})
       @string   = options[:lexical] if options.has_key?(:lexical)
       @string   ||= value if value.is_a?(String)
       @object   = case
-        when value.is_a?(BigDecimal) then value
-        when value.is_a?(Numeric) then BigDecimal(value)
+        when value.is_a?(::BigDecimal) then value
+        when value.is_a?(::Float)      then BigDecimal(value.to_s)
+        when value.is_a?(::Numeric)    then BigDecimal(value)
         else
           value = value.to_s
           value += "0" if value.end_with?(".")  # Normalization required in Ruby 2.4

spec/model_literal_spec.rb

@@ -454,6 +454,7 @@ def self.literals(*selector)
         BigDecimal('1.0') => ["1.0", "1.0"],
         BigDecimal('0') => ["0.0", "0.0"],
         BigDecimal('10.10') => ["10.1", "10.1"],
+        1.1                 => ["1.1", "1.1"],
       }.each do |obj, (str, canon)|
         it "to_str #{obj} to #{str.inspect}" do
           expect(RDF::Literal::Decimal.new(obj).to_s).to eql str