Changes based on review.

Author: aardvark179

spec/ruby/optional/capi/string_spec.rb

@@ -891,10 +891,20 @@ def inspect
       @s.rb_sprintf3(ToSOrInspect.new).should == s
     end
 
-    it "formats a string VALUE using to inspect if sign specified in format" do
+    it "formats a string VALUE using inspect if sign specified in format" do
       s = 'Result: A different string.'
       @s.rb_sprintf4(ToSOrInspect.new).should == s
     end
+
+    it "formats a TrueClass VALUE as `TrueClass` if sign not specified in format" do
+      s = 'Result: TrueClass.'
+      @s.rb_sprintf3(true.class).should == s
+    end
+
+    it "formats a TrueClass VALUE as 'true' if sign specified in format" do
+      s = 'Result: true.'
+      @s.rb_sprintf4(true.class).should == s
+    end
   end
 
   describe "rb_vsprintf" do

src/main/c/cext/ruby.c

@@ -32,8 +32,6 @@ void* rb_tr_true;
 void* rb_tr_false;
 void* rb_tr_nil;
 
-// Run when loading C-extension support
-
 #ifdef __APPLE__
 static printf_domain_t printf_domain;
 
@@ -70,10 +68,6 @@ static int rb_tr_fprintf_value(FILE *stream,
     if (RB_TYPE_P(v, T_CLASS)) {
       if (v == rb_cNilClass) {
         cstr = "nil";
-      } else if (v == rb_cInteger) {
-        cstr = "Integer";
-      } else if (v == rb_cSymbol) {
-        cstr = "Symbol";
       } else if (v == rb_cTrueClass) {
         cstr = "true";
       } else if (v == rb_cFalseClass) {
@@ -94,6 +88,8 @@ static int rb_tr_fprintf_value(FILE *stream,
   return len;
 }
 
+// Run when loading C-extension support
+
 void rb_tr_init(void *ruby_cext) {
   truffle_assign_managed(&rb_tr_cext, ruby_cext);
   truffle_assign_managed(&rb_tr_undef, rb_tr_get_undef());