diff --git a/TODO b/TODO
index dd41430c..0b7dc1d0 100644
--- a/TODO
+++ b/TODO
@@ -1,10 +1,3 @@
-Next ABI
-========
-
- * Check all overloaded methods to see if any can be eliminated by
-   using defaulted arguments. See ../misc/find-overloaded-functions.pl
-   (not in source repo)
-
 Lexical
 =======
 
diff --git a/include/qpdf/QPDFWriter.hh b/include/qpdf/QPDFWriter.hh
index 703d752f..860b0630 100644
--- a/include/qpdf/QPDFWriter.hh
+++ b/include/qpdf/QPDFWriter.hh
@@ -248,9 +248,7 @@ class QPDFWriter
     // R3 encryption parameters are used, and to 1.5 when object
     // streams are used.
     QPDF_DLL
-    void setMinimumPDFVersion(std::string const&);
-    QPDF_DLL
-    void setMinimumPDFVersion(std::string const&, int extension_level);
+    void setMinimumPDFVersion(std::string const&, int extension_level = 0);
 
     // Force the PDF version of the output file to be a given version.
     // Use of this function may create PDF files that will not work
@@ -268,9 +266,7 @@ class QPDFWriter
     // Additionally, forcing to a version below 1.5 will disable
     // object streams.
     QPDF_DLL
-    void forcePDFVersion(std::string const&);
-    QPDF_DLL
-    void forcePDFVersion(std::string const&, int extension_level);
+    void forcePDFVersion(std::string const&, int extension_level = 0);
 
     // Provide additional text to insert in the PDF file somewhere
     // near the beginning of the file.  This can be used to add
@@ -483,10 +479,9 @@ class QPDFWriter
     void writeTrailer(trailer_e which, int size,
 		      bool xref_stream, qpdf_offset_t prev,
                       int linearization_pass);
-    void unparseObject(QPDFObjectHandle object, int level, int flags);
     void unparseObject(QPDFObjectHandle object, int level, int flags,
 		       // for stream dictionaries
-		       size_t stream_length, bool compress);
+		       size_t stream_length = 0, bool compress = false);
     void unparseChild(QPDFObjectHandle child, int level, int flags);
     void initializeSpecialStreams();
     void preserveObjectStreams();
diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 93a634f2..7702dc34 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -231,12 +231,6 @@ QPDFWriter::setNewlineBeforeEndstream(bool val)
     this->m->newline_before_endstream = val;
 }
 
-void
-QPDFWriter::setMinimumPDFVersion(std::string const& version)
-{
-    setMinimumPDFVersion(version, 0);
-}
-
 void
 QPDFWriter::setMinimumPDFVersion(std::string const& version,
                                  int extension_level)
@@ -285,12 +279,6 @@ QPDFWriter::setMinimumPDFVersion(std::string const& version,
     }
 }
 
-void
-QPDFWriter::forcePDFVersion(std::string const& version)
-{
-    forcePDFVersion(version, 0);
-}
-
 void
 QPDFWriter::forcePDFVersion(std::string const& version,
                             int extension_level)
@@ -1433,12 +1421,6 @@ QPDFWriter::writeTrailer(trailer_e which, int size, bool xref_stream,
     writeString(">>");
 }
 
-void
-QPDFWriter::unparseObject(QPDFObjectHandle object, int level, int flags)
-{
-    unparseObject(object, level, flags, 0, false);
-}
-
 void
 QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
 			  int flags, size_t stream_length,
@@ -2811,6 +2793,9 @@ QPDFWriter::writeHintStream(int hint_id)
 qpdf_offset_t
 QPDFWriter::writeXRefTable(trailer_e which, int first, int last, int size)
 {
+    // There are too many extra arguments to replace overloaded
+    // function with defaults in the header file...too much risk of
+    // leaving something off.
     return writeXRefTable(which, first, last, size, 0, false, 0, 0, 0, 0);
 }
 
@@ -2858,6 +2843,9 @@ qpdf_offset_t
 QPDFWriter::writeXRefStream(int objid, int max_id, qpdf_offset_t max_offset,
 			    trailer_e which, int first, int last, int size)
 {
+    // There are too many extra arguments to replace overloaded
+    // function with defaults in the header file...too much risk of
+    // leaving something off.
     return writeXRefStream(objid, max_id, max_offset,
 			   which, first, last, size, 0, 0, 0, 0, false, 0);
 }