Revert decode_traits change

Author: danielaparker

include/jsoncons/decode_traits.hpp

@@ -336,10 +336,6 @@ namespace jsoncons {
                 case staj_event_type::begin_array:
                 {
                     T v;
-                    if (cursor.current().size() > 0)
-                    {
-                        v.capacity(cursor.current().size());
-                    }
                     typed_array_visitor<T> visitor(v);
                     cursor.read_to(visitor, ec);
                     return v;
@@ -379,10 +375,6 @@ namespace jsoncons {
                 case staj_event_type::begin_array:
                 {
                     T v;
-                    if (cursor.current().size() > 0)
-                    {
-                        v.capacity(cursor.current().size());
-                    }
                     typed_array_visitor<T> visitor(v);
                     cursor.read_to(visitor, ec);
                     return v;
@@ -497,10 +489,6 @@ namespace jsoncons {
                 ec = conv_errc::not_map;
                 return val;
             }
-            if (cursor.current().size() > 0)
-            {
-                val.capacity(cursor.current().size());
-            }
             cursor.next(ec);
 
             while (cursor.current().event_type() != staj_event_type::end_object && !ec)
@@ -545,10 +533,6 @@ namespace jsoncons {
                 ec = conv_errc::not_map;
                 return val;
             }
-            if (cursor.current().size() > 0)
-            {
-                val.capacity(cursor.current().size());
-            }
             cursor.next(ec);
 
             while (cursor.current().event_type() != staj_event_type::end_object && !ec)