[ruby/bigdecimal] Fix for the coerce cases in divide and DoDivmod

https://github.com/ruby/bigdecimal/commit/1cb92487f7

ext/bigdecimal/bigdecimal.c

@@ -1356,16 +1356,19 @@ BigDecimal_divide(VALUE self, VALUE r, Real **c, Real **res, Real **div)
     TypedData_Get_Struct(self, Real, &BigDecimal_data_type, a);
     SAVE(a);
 
-    VALUE rr = Qnil;
-    if (RB_TYPE_P(r, T_FLOAT)) {
+    VALUE rr = r;
+    if (is_kind_of_BigDecimal(rr)) {
+        /* do nothing */
+    }
+    else if (RB_INTEGER_TYPE_P(r)) {
+        rr = rb_inum_convert_to_BigDecimal(r, 0, true);
+    }
+    else if (RB_TYPE_P(r, T_FLOAT)) {
         rr = rb_float_convert_to_BigDecimal(r, 0, true);
     }
     else if (RB_TYPE_P(r, T_RATIONAL)) {
         rr = rb_rational_convert_to_BigDecimal(r, a->Prec*BASE_FIG, true);
     }
-    else {
-        rr = rb_convert_to_BigDecimal(r, 0, false);
-    }
 
     if (!is_kind_of_BigDecimal(rr)) {
         return DoSomeOne(self, r, '/');
@@ -1429,16 +1432,19 @@ BigDecimal_DoDivmod(VALUE self, VALUE r, Real **div, Real **mod)
     TypedData_Get_Struct(self, Real, &BigDecimal_data_type, a);
     SAVE(a);
 
-    VALUE rr = Qnil;
-    if (RB_TYPE_P(r, T_FLOAT)) {
+    VALUE rr = r;
+    if (is_kind_of_BigDecimal(rr)) {
+        /* do nothing */
+    }
+    else if (RB_INTEGER_TYPE_P(r)) {
+        rr = rb_inum_convert_to_BigDecimal(r, 0, true);
+    }
+    else if (RB_TYPE_P(r, T_FLOAT)) {
         rr = rb_float_convert_to_BigDecimal(r, 0, true);
     }
     else if (RB_TYPE_P(r, T_RATIONAL)) {
         rr = rb_rational_convert_to_BigDecimal(r, a->Prec*BASE_FIG, true);
     }
-    else {
-        rr = rb_convert_to_BigDecimal(r, 0, false);
-    }
 
     if (!is_kind_of_BigDecimal(rr)) {
         return Qfalse;

test/bigdecimal/test_bigdecimal.rb

@@ -963,6 +963,15 @@ class TestBigDecimal < Test::Unit::TestCase
     assert_kind_of(BigDecimal, BigDecimal("3") / 1.quo(3))
   end
 
+  def test_div_with_complex
+    q = BigDecimal("3") / 1i
+    assert_kind_of(Complex, q)
+  end
+
+  def test_div_error
+    assert_raise(TypeError) { BigDecimal(20) / '2' }
+  end
+
   def test_mod
     x = BigDecimal((2**100).to_s)
     assert_equal(1, x % 3)
@@ -1006,6 +1015,10 @@ class TestBigDecimal < Test::Unit::TestCase
     assert_raise(ZeroDivisionError){BigDecimal("0").divmod(0)}
   end
 
+  def test_divmod_error
+    assert_raise(TypeError) { BigDecimal(20).divmod('2') }
+  end
+
   def test_add_bigdecimal
     x = BigDecimal((2**100).to_s)
     assert_equal(3000000000000000000000000000000, x.add(x, 1))