Fixes #2902. Enumerable#find_index gives wrong result in case with types cast

Conflicts:
	core/src/main/java/org/jruby/RubyEnumerable.java

Author: enebo

core/src/main/java/org/jruby/RubyEnumerable.java

@@ -54,6 +54,7 @@
 import static org.jruby.CompatVersion.RUBY1_8;
 import static org.jruby.CompatVersion.RUBY1_9;
 import static org.jruby.RubyEnumerator.enumeratorize;
+import static org.jruby.RubyObject.equalInternal;
 import static org.jruby.runtime.Helpers.invokedynamic;
 import static org.jruby.runtime.invokedynamic.MethodNames.OP_CMP;
 
@@ -666,7 +667,7 @@ public static IRubyObject find_indexCommon(ThreadContext context, IRubyObject se
             callEach(runtime, context, self, Arity.ONE_ARGUMENT, new BlockCallback() {
                 public IRubyObject call(ThreadContext ctx, IRubyObject[] largs, Block blk) {
                     IRubyObject larg = packEnumValues(runtime, largs);
-                    if (larg.equals(cond)) throw JumpException.SPECIAL_JUMP;
+                    if (equalInternal(ctx, larg, cond)) throw JumpException.SPECIAL_JUMP;
                     result[0]++;
                     return runtime.getNil();
                 }