diff --git a/library/bigdecimal/BigDecimal_spec.rb b/library/bigdecimal/BigDecimal_spec.rb
index 01772bf9af..8596356abd 100644
--- a/library/bigdecimal/BigDecimal_spec.rb
+++ b/library/bigdecimal/BigDecimal_spec.rb
@@ -31,16 +31,12 @@
   end
 
   it "accepts significant digits >= given precision" do
-    suppress_warning do
-      BigDecimal("3.1415923", 10).precs[1].should >= 10
-    end
+    BigDecimal("3.1415923", 10).should == BigDecimal("3.1415923")
   end
 
   it "determines precision from initial value" do
     pi_string = "3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593014782083152134043"
-    suppress_warning {
-      BigDecimal(pi_string).precs[1]
-    }.should >= pi_string.size-1
+    BigDecimal(pi_string).precision.should == pi_string.size-1
   end
 
   it "ignores leading and trailing whitespace" do
@@ -208,14 +204,6 @@ def to_s; "cheese"; end
       Float(@b).to_s.should == "166.66666666666666"
     end
 
-    it "has the expected precision on the LHS" do
-      suppress_warning { @a.precs[0] }.should == 18
-    end
-
-    it "has the expected maximum precision on the LHS" do
-      suppress_warning { @a.precs[1] }.should == 27
-    end
-
     it "produces the expected result when done via Float" do
       (Float(@a) - Float(@b)).to_s.should == "-6.666596163995564e-10"
     end
@@ -226,34 +214,10 @@ def to_s; "cheese"; end
 
     # Check underlying methods work as we understand
 
-    it "BigDecimal precision is the number of digits rounded up to a multiple of nine" do
-      1.upto(100) do |n|
-        b = BigDecimal('4' * n)
-        precs, _ = suppress_warning { b.precs }
-        (precs >= 9).should be_true
-        (precs >= n).should be_true
-        (precs % 9).should == 0
-      end
-      suppress_warning { BigDecimal('NaN').precs[0] }.should == 9
-    end
-
-    it "BigDecimal maximum precision is nine more than precision except for abnormals" do
-      1.upto(100) do |n|
-        b = BigDecimal('4' * n)
-        precs, max = suppress_warning { b.precs }
-        max.should == precs + 9
-      end
-      suppress_warning { BigDecimal('NaN').precs[1] }.should == 9
-    end
-
     it "BigDecimal(Rational, 18) produces the result we expect" do
       BigDecimal(@b, 18).to_s.should == "0.166666666666666667e3"
     end
 
-    it "BigDecimal(Rational, BigDecimal.precs[0]) produces the result we expect" do
-      BigDecimal(@b, suppress_warning { @a.precs[0] }).to_s.should == "0.166666666666666667e3"
-    end
-
     # Check the top-level expression works as we expect
 
     it "produces a BigDecimal" do
diff --git a/library/bigdecimal/divmod_spec.rb b/library/bigdecimal/divmod_spec.rb
index c519783d14..85c014bb8c 100644
--- a/library/bigdecimal/divmod_spec.rb
+++ b/library/bigdecimal/divmod_spec.rb
@@ -33,14 +33,16 @@ class BigDecimal
     end
   end
 
-  it_behaves_like :bigdecimal_modulo, :mod_part_of_divmod
+  version_is BigDecimal::VERSION, ""..."4.0.0" do
+    it_behaves_like :bigdecimal_modulo, :mod_part_of_divmod
+  end
 
   it "raises ZeroDivisionError if other is zero" do
     bd5667 = BigDecimal("5667.19")
-
+    zero = BigDecimal("0")
     -> { bd5667.mod_part_of_divmod(0) }.should raise_error(ZeroDivisionError)
     -> { bd5667.mod_part_of_divmod(BigDecimal("0")) }.should raise_error(ZeroDivisionError)
-    -> { @zero.mod_part_of_divmod(@zero) }.should raise_error(ZeroDivisionError)
+    -> { zero.mod_part_of_divmod(zero) }.should raise_error(ZeroDivisionError)
   end
 end
 
@@ -73,14 +75,25 @@ class BigDecimal
     @zeroes = [@zero, @zero_pos, @zero_neg]
   end
 
-  it "divides value, returns an array" do
-    res = @a.divmod(5)
-    res.kind_of?(Array).should == true
+  version_is BigDecimal::VERSION, ""..."4.0.0" do
+    it "divides value, returns [BigDecimal, BigDecimal]" do
+      res = @a.divmod(5)
+      res.kind_of?(Array).should == true
+      DivmodSpecs.check_both_bigdecimal(res)
+    end
+  end
+
+  version_is BigDecimal::VERSION, "4.0.0" do
+    it "divides value, returns [Integer, BigDecimal]" do
+      res = @a.divmod(5)
+      res.kind_of?(Array).should == true
+      res[0].kind_of?(Integer).should == true
+      res[1].kind_of?(BigDecimal).should == true
+    end
   end
 
   it "array contains quotient and modulus as BigDecimal" do
     res = @a.divmod(5)
-    DivmodSpecs.check_both_bigdecimal(res)
     res[0].should == BigDecimal('0.8E1')
     res[1].should == BigDecimal('2.00000000000000000001')
 
@@ -123,17 +136,27 @@ class BigDecimal
     values_and_zeroes.each do |val1|
       values.each do |val2|
         res = val1.divmod(val2)
-        DivmodSpecs.check_both_bigdecimal(res)
         res[0].should == ((val1/val2).floor)
         res[1].should == (val1 - res[0] * val2)
       end
     end
   end
 
-  it "returns an array of two NaNs if NaN is involved" do
-    (@special_vals + @regular_vals + @zeroes).each do |val|
-      DivmodSpecs.check_both_nan(val.divmod(@nan))
-      DivmodSpecs.check_both_nan(@nan.divmod(val))
+  version_is BigDecimal::VERSION, "4.0.0" do
+    it "raise FloatDomainError error if NaN is involved" do
+      (@special_vals + @regular_vals + @zeroes).each do |val|
+        -> { val.divmod(@nan) }.should raise_error(FloatDomainError)
+        -> { @nan.divmod(val) }.should raise_error(FloatDomainError)
+      end
+    end
+  end
+
+  version_is BigDecimal::VERSION, ""..."4.0.0" do
+    it "returns an array of two NaNs if NaN is involved" do
+      (@special_vals + @regular_vals + @zeroes).each do |val|
+        DivmodSpecs.check_both_nan(val.divmod(@nan))
+        DivmodSpecs.check_both_nan(@nan.divmod(val))
+      end
     end
   end
 
@@ -145,12 +168,14 @@ class BigDecimal
     end
   end
 
-  it "returns an array of Infinity and NaN if the dividend is Infinity" do
-    @regular_vals.each do |val|
-      array = @infinity.divmod(val)
-      array.length.should == 2
-      array[0].infinite?.should == (val > 0 ? 1 : -1)
-      array[1].should.nan?
+  version_is BigDecimal::VERSION, ""..."4.0.0" do
+    it "returns an array of Infinity and NaN if the dividend is Infinity" do
+      @regular_vals.each do |val|
+        array = @infinity.divmod(val)
+        array.length.should == 2
+        array[0].infinite?.should == (val > 0 ? 1 : -1)
+        array[1].should.nan?
+      end
     end
   end
 
diff --git a/library/bigdecimal/precs_spec.rb b/library/bigdecimal/precs_spec.rb
deleted file mode 100644
index 5fda8d3087..0000000000
--- a/library/bigdecimal/precs_spec.rb
+++ /dev/null
@@ -1,55 +0,0 @@
-require_relative '../../spec_helper'
-require 'bigdecimal'
-
-describe "BigDecimal#precs" do
-  before :each do
-    @infinity = BigDecimal("Infinity")
-    @infinity_neg = BigDecimal("-Infinity")
-    @nan = BigDecimal("NaN")
-    @zero = BigDecimal("0")
-    @zero_neg = BigDecimal("-0")
-
-    @arr = [BigDecimal("2E40001"), BigDecimal("3E-20001"),\
-            @infinity, @infinity_neg, @nan, @zero, @zero_neg]
-    @precision = BigDecimal::BASE.to_s.length - 1
-  end
-
-  it "returns array of two values" do
-    suppress_warning do
-      @arr.each do |x|
-        x.precs.kind_of?(Array).should == true
-        x.precs.size.should == 2
-      end
-    end
-  end
-
-  it "returns Integers as array values" do
-    suppress_warning do
-      @arr.each do |x|
-        x.precs[0].kind_of?(Integer).should == true
-        x.precs[1].kind_of?(Integer).should == true
-      end
-    end
-  end
-
-  it "returns the current value of significant digits as the first value" do
-    suppress_warning do
-      BigDecimal("3.14159").precs[0].should >= 6
-      BigDecimal('1').precs[0].should == BigDecimal('1' + '0' * 100).precs[0]
-      [@infinity, @infinity_neg, @nan, @zero, @zero_neg].each do |value|
-        value.precs[0].should <= @precision
-      end
-    end
-  end
-
-  it "returns the maximum number of significant digits as the second value" do
-    suppress_warning do
-      BigDecimal("3.14159").precs[1].should >= 6
-      BigDecimal('1').precs[1].should >= 1
-      BigDecimal('1' + '0' * 100).precs[1].should >= 101
-      [@infinity, @infinity_neg, @nan, @zero, @zero_neg].each do |value|
-        value.precs[1].should >= 1
-      end
-    end
-  end
-end