Import bigdecimal-1.4.0.pre-20181130a

* https://github.com/ruby/bigdecimal/compare/74d25ef..v1.4.0.pre.20181130a

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66124 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 24 insertions, 9 deletions

diff --git a/ext/bigdecimal/lib/bigdecimal/jacobian.rb b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
index 9cad06c09b..84c50248b7 100644
--- a/ext/bigdecimal/lib/bigdecimal/jacobian.rb
+++ b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
@@ -21,6 +21,9 @@
 #
 # fx is f.values(x).
 #
+
+require 'bigdecimal'
+
 module Jacobian
   module_function
 
diff --git a/ext/bigdecimal/lib/bigdecimal/util.rb b/ext/bigdecimal/lib/bigdecimal/util.rb
index 911fa6fe3a..88f490cb45 100644
--- a/ext/bigdecimal/lib/bigdecimal/util.rb
+++ b/ext/bigdecimal/lib/bigdecimal/util.rb
@@ -5,6 +5,8 @@
 # and provides BigDecimal#to_d and BigDecimal#to_digits.
 #++
 
+require 'bigdecimal'
+require 'bigdecimal/util.so'
 
 class Integer < Numeric
   # call-seq:
@@ -42,8 +44,8 @@ class Float < Numeric
   #
   # See also BigDecimal::new.
   #
-  def to_d(precision=nil)
-    BigDecimal(self, precision || Float::DIG)
+  def to_d(precision=Float::DIG)
+    BigDecimal(self, precision)
   end
 end
 
@@ -64,13 +66,6 @@ class String
   #
   # See also BigDecimal::new.
   #
-  def to_d
-    begin
-      BigDecimal(self)
-    rescue ArgumentError
-      BigDecimal(0)
-    end
-  end
 end
 
 
@@ -132,3 +127,20 @@ class Rational < Numeric
     BigDecimal(self, precision)
   end
 end
+
+
+class NilClass
+  # call-seq:
+  #     nil.to_d -> bigdecimal
+  #
+  # Returns nil represented as a BigDecimal.
+  #
+  #     require 'bigdecimal'
+  #     require 'bigdecimal/util'
+  #
+  #     nil.to_d   # => 0.0
+  #
+  def to_d
+    BigDecimal(0)
+  end
+end