Detect and cast values with int & float defaults

lib/hashr/env.rb

@@ -29,6 +29,8 @@ def cast(value, default, keys)
             value.respond_to?(:split) ? value.split(',') : Array(value)
           when true, false
             not FALSE.include?(value)
+          when Integer then Integer(value)
+          when Float then Float(value)
           else
             value
           end

spec/hashr/env_spec.rb

@@ -8,7 +8,9 @@
       define string: 'string',
              hash:   { key: 'value' },
              array:  ['foo', 'bar'],
-             bool:   false
+             bool:   false,
+             int:    4,
+             float:  11.1
     end
   end
 
@@ -55,6 +57,45 @@
         expect(klass.new.array).to eq([])
       end
     end
+
+    describe 'to an int' do
+      it 'int given' do
+        ENV['HASHR_INT'] = '1'
+        expect(klass.new.int).to eq(1)
+      end
+
+      it 'errors for an empty string' do
+        ENV['HASHR_INT'] = ''
+        expect { klass.new.int }.to raise_error(ArgumentError)
+      end
+
+      it 'errors for a non-int' do
+        ENV['HASHR_INT'] = 'a'
+        expect { klass.new.int }.to raise_error(ArgumentError)
+      end
+    end
+
+    describe 'to a float' do
+      it 'float given' do
+        ENV['HASHR_FLOAT'] = '2.3'
+        expect(klass.new.float).to eq(2.3)
+      end
+
+      it 'int given' do
+        ENV['HASHR_FLOAT'] = '4'
+        expect(klass.new.float).to eq(4.0)
+      end
+
+      it 'errors for an empty string' do
+        ENV['HASHR_FLOAT'] = ''
+        expect { klass.new.float }.to raise_error(ArgumentError)
+      end
+
+      it 'errors for a non-float' do
+        ENV['HASHR_FLOAT'] = 'a'
+        expect { klass.new.float }.to raise_error(ArgumentError)
+      end
+    end
   end
 
   it 'data takes precedence over an env var' do