Merge pull request #2627 from mattn/fix-2626

Handle Array#[float, int] Close #2626

src/array.c

@@ -658,6 +658,9 @@ aget_index(mrb_state *mrb, mrb_value index)
   if (mrb_fixnum_p(index)) {
     return mrb_fixnum(index);
   }
+  else if (mrb_float_p(index)) {
+    return mrb_float(index);
+  }
   else {
     mrb_int i;