Next Release 0.15
   =====================
   
   Deprecated and removed features:
   --------------------------------
   * Deprecate `array_list_new()` in favor of `array_list_new2()`
   * Remove the THIS_FUNCTION_IS_DEPRECATED define.
   * Remove config.h.win32
  
  New features
  ------------
  * Add a `JSON_TOKENER_ALLOW_TRAILING_CHARS` flag to allow multiple objects
    to be parsed even when `JSON_TOKENER_STRICT` is set.
  * Add `json_object_new_array_ext(int)` and `array_list_new_2(int)` to allow
     arrays to be allocated with the exact size needed, when known.
  * Add `json_object_array_shrink()` (and `array_list_shrink()`) and use it in 
     json_tokener to minimize the amount of memory used.
  * Add a json_parse binary, for use in testing changes (not installed, but 
     available in the apps directory).
  
  Build changes
  -------------
  * #639/#621 - Add symbol versions to all exported symbols
  * #508/#634 - Always enable -fPIC to allow use of the json-c static library in
     other libraries
  * Build both static and shared libraries at the same time.
  * #626 - Restore compatibility with cmake 2.8 
  * #471 - Always create directories with mode 0755, regardless of umask.
  * #606/#604 - Improve support for OSes like AIX and IBM i, as well as for
     MINGW32 and old versions of MSVC
  * #451/#617 - Add a DISABLE_THREAD_LOCAL_STORAGE cmake option to disable 
     the use of thread-local storage.
  
  Significant changes and bug fixes
  ---------------------------------
  * Split the internal json_object structure into several sub-types, one for
     each json_type (json_object_object, json_object_string, etc...).
    This improves memory usage and speed, with the benchmark under
     bench/ report 5.8% faster test time and 6%(max RSS)-12%(peak heap)
     less memory usage.
    Memory used just for json_object structures decreased 27%, so use cases
     with fewer arrays and/or strings would benefit more.
  * Minimize memory usage in array handling in json_tokener by shrinking
     arrays to the exact number of elements parsed.  On bench/ benchmark:
     9% faster test time, 39%(max RSS)-50%(peak heap) less memory usage.
     Add json_object_array_shrink() and array_list_shrink() functions.
  * #616 - Parsing of surrogate pairs in unicode escapes now properly handles
     incremental parsing.
  * Fix incremental parsing of numbers, especially those with exponents, e.g.
     so parsing "[0", "e+", "-]" now properly returns an error.
    Strict mode now rejects missing exponents ("0e").
  * Successfully return number objects at the top level even when they are
     followed by a "-", "." or "e".  This makes parsing things like "123-45"
     behave consistently with things like "123xyz".
  
  Other changes
  -------------
  * #589 - Detect broken RDRAND during initialization; also, fix segfault
      in the CPUID check.
  * #592 - Fix integer overflows to prevert out of bounds write on large input.
  * Protect against division by zero in linkhash, when creaed with zero size.
  * #602 - Fix json_parse_uint64() internal error checking, leaving the retval
      untouched in more failure cases.
  * #614 - Prevent truncation when custom double formatters insert extra \0's
  
  
  ***
  
  0.14 (up to commit 9ed00a6, 2020/04/14)
  =========================================
  
  Deprecated and removed features:
  --------------------------------
  * bits.h has been removed
  * lh_abort() has been removed
  * lh_table_lookup() has been removed, use lh_table_lookup_ex() instead.
  * Remove TRUE and FALSE defines, use 1 and 0 instead.
  
  Build changes:
  --------------
  ## Deprecated and removed features:
  * bits.h has been removed
  * lh_abort() has been removed
  * lh_table_lookup() has been removed, use lh_table_lookup_ex() instead.
  * Remove TRUE and FALSE defines, use 1 and 0 instead.
  * autoconf support, including autogen.sh, has been removed.  See details about cmake, below.
  * With the addition of json_tokener_get_parse_end(), access to internal fields of json_tokener, as well as use of many other symbols and types in json_tokener.h, is deprecated now.
  * The use of Android.configure.mk to build for Android no longer works, and it is unknown how (or if) the new cmake-based build machinery can be used.
      * Reports of success, or pull requests to correct issues are welcome.
  
  ## Notable improvements and new features
  
  ### Builds and documentation
  * Build machinery has been switched to CMake.  See README.md for details about how to build.
      * TL;DR: `mkdir build ; cd build ; cmake -DCMAKE_INSTALL_PREFIX=/some/path ../json-c ; make all test install`
      * To ease the transition, there is a `cmake-configure` wrapper that emulates the old autoconf-based configure script.
      * This has enabled improvements to the build on Windows system; also all public functions have been fixed to be properly exported.  For best results, use Visual Studio 2015 or newer.
  * The json-c style guide has been updated to specify the use of clang-format, and all code has been reformatted.
     * Since many lines of code have trivial changes now, when using git blame, be sure to specify -w
 * Numerous improvements have been made to the documentation including function effects on refcounts, when passing a NULL is safe, and so on.
 
 ### json_tokener changes
 * Added a json_tokener_get_parse_end() function to replace direct access of tok->char_offset.
     * The char_offset field, and the rest of the json_tokener structure remain exposed for now, but expect a future release to hide it like is done with json_object_private.h
 * json_tokener_parse_ex() now accepts a new JSON_TOKENER_VALIDATE_UTF8 flag to validate that input is UTF8.
     * If validation fails, json_tokener_get_error(tok) will return json_tokener_error_parse_utf8_string (see enum json_tokener_error).
 
 ### Other changes and additions
 * Add support for unsigned 64-bit integers, uint64_t, to gain one extra bit of magnitude for positive ints.
     * json_tokener will now parse values up to UINT64_MAX (18446744073709551615)
     * Existing methods returning int32_t or int64_t will cap out-of-range values at INT32_MAX or INT64_MAX, preserving existing behavior.
     * The implementation includes the possibility of easily extending this to larger sizes in the future.
 * A total of 7 new functions were added:
     * json_object_get_uint64 ( struct json_object const* jso )
     * json_object_new_uint64 ( uint64_t i )
     * json_object_set_uint64 ( struct json_object* jso, uint64_t new_value )
     * json_parse_uint64 ( char const* buf, uint64_t* retval )
         * See description of uint64 support, above.
     * json_tokener_get_parse_end ( struct json_tokener* tok )
         * See details under "json_tokener changes", above.
     * json_object_from_fd_ex ( int fd, int in_depth )
         * Allows the max nesting depth to be specified.
     * json_object_new_null ( )
         * Simply returns NULL.  Its use is not recommended.
 * The size of struct json_object has decreased from 96 bytes to 88 bytes.
 
 ### Testing
 * Many updates were made to test cases, increasing code coverage.
 * There is now a quick way (JSONC_TEST_TRACE=1) to turn on shell tracing in tests.
 * To run tests, use `make test`; the old "check" target no longer exists.
 
 ## Significant bug fixes
 For the full list of issues and pull requests since the previous release, please see issues_closed_for_0.14.md
 
 * [Issue #389](https://github.com/json-c/json-c/issues/389): Add an assert to explicitly crash when _ref_count is corrupted, instead of a later "double free" error.
 * [Issue #407](https://github.com/json-c/json-c/issues/407): fix incorrect casts in calls to ctype functions (isdigit and isspace) so we don't crash when asserts are enabled on certain platforms and characters > 128 are parsed.
 * [Issue #418](https://github.com/json-c/json-c/issues/418): Fix docs for json_util_from_fd and json_util_from_file to say that they return NULL on failures.
 * [Issue #422](https://github.com/json-c/json-c/issues/422): json_object.c:set errno in json_object_get_double() when called on a json_type_string object with bad content.
 * [Issue #453](https://github.com/json-c/json-c/issues/453): Fixed misalignment in JSON serialization when JSON_C_TO_STRING_SPACED and JSON_C_TO_STRING_PRETTY are used together.
 * [Issue #463](https://github.com/json-c/json-c/issues/463): fix newlocale() call to use LC_NUMERIC_MASK instead of LC_NUMERIC, and remove incorrect comment.
 * [Issue #486](https://github.com/json-c/json-c/issues/486): append a missing ".0" to negative double values to ensure they are serialized as floating point numbers.
 * [Issue #488](https://github.com/json-c/json-c/issues/488): use JSON_EXPORT on functions so they are properly exported on Windows.
 * [Issue #539](https://github.com/json-c/json-c/issues/539): use an internal-only serializer function in json_object_new_double_s() to avoid potential conflicts with user code that uses the json_object_userdata_to_json_string serializer.
 
 ***
 
 0.13.1 (up to commit 0f814e5, 2018/03/04)
 =========================================
 
 * Bump the major version of the .so library generated up to 4.0 to avoid
   conflicts because some downstream packagers of json-c had already done
   their own bump to ".so.3" for a much older 0.12 release.
 * Add const size_t json_c_object_sizeof()
 * Avoid invalid free (and thus a segfault) when ref_count gets < 0
 * PR#394: fix handling of custom double formats that include a ".0"
 * Avoid uninitialized variable warnings in json_object_object_foreach
 * Issue #396: fix build for certain uClibc based systems.
 * Add a top level fuzz directory for fuzzers run by OSS-Fuzz
 
 
 0.13 (up to commit 5dae561, 2017/11/29)
 =================================
 
 This release, being three and a half years after the 0.12 branch (f84d9c),
    has quite a number of changes included.  The following is a sampling of
    the most significant ones.
 
 Since the 0.12 release, 250 issues and pull requests have been closed.
 See issues_closed_for_0.13.md for a complete list.
 
 
 Deprecated and removed features:
 --------------------------------
 * All internal use of bits.h has been eliminated.  The file will be removed.
         Do not use: hexdigit(), error_ptr(), error_descrition() and it_error()
 * lh_abort() is deprecated.  It will be removed.
 
 Behavior changes:
 -----------------
 * Tighten the number parsing algorithm to raise errors instead of truncating
      the results.  For example 12.3.4 or 2015-01-15, which now return null.
          See commit 99d8fc
 
 * Use size_t for array length and size.  Platforms where sizeof(size_t) != sizeof(int) may not be backwards compatible
         See commits 45c56b, 92e9a5 and others.
 
 * Check for failue when allocating memory, returning NULL and errno=ENOMEM.
          See commit 2149a04.
 
 * Change json_object_object_add() return type from void to int, and will return -1 on failures, instead of exiting. (Note: this is not an ABI change)
 
 New features:
 -------------
 * We're aiming to follow RFC 7159 now.
 
 * Add a couple of additional option to json_object_to_json_string_ext:
         JSON_C_TO_STRING_PRETTY_TAB
         JSON_C_TO_STRING_NOSLASHESCAPE
 
 * Add a json_object_object_add_ex() function to allow for performance
         improvements when certain constraints are known to be true.
 
 * Make serialization format of doubles configurable, in two different ways:
         Call json_object_set_serializer with json_object_double_to_json_string and a custom
          format on each double object, or
         Call json_c_set_serialization_double_format() to set a global or thread-wide format.
 
 * Add utility function for comparing json_objects - json_object_equal()
 
 * Add a way to copy entire object trees: json_object_deep_copy()
 * Add json_object_set_<type> function to modify the value of existing json_object's
  without the need to recreate them.  Also add a json_object_int_inc function to
  adjust an int's value.
 * Add support for JSON pointer, RFC 6901.  See json_pointer.h
 * Add a json_util_get_last_err() function to retrieve the string describing the
  cause of errors, instead of printing to stderr.
 * Add perllike hash function for strings, and json_global_set_string_hash() 8f8d03d
 * Add a json_c_visit() function to provide a way to iterate over a tree of json-c objects.
 
 Notable bug fixes and other improvements:
 -----------------------------------------
 * Make reference increment and decrement atomic to allow passing json objects between threads.
 * Fix json_object_object_foreach to avoid uninitialized variable warnings.
 * Improve performance by removing unneeded data items from hashtable code and reducing duplicate hash computation.
 * Improve performance by storing small strings inside json_object
 * Improve performance of json_object_to_json_string by removing variadic printf. commit 9ff0f49
 * Issue #371: fix parsing of "-Infinity", and avoid needlessly copying the input when doing so.
 * Fix stack buffer overflow in json_object_double_to_json_string_format() - commit 2c2deb87
 * Fix various potential null ptr deref and int32 overflows
 * Issue #332: fix a long-standing bug in array_list_put_idx() where it would attempt to free previously free'd entries due to not checking the current array length.
 * Issue #195: use uselocale() instead of setlocale() in json_tokener to behave better in threaded environments.
 * Issue #275: fix out of bounds read when handling unicode surrogate pairs.
 * Ensure doubles that happen to be a whole number are emitted with ".0" - commit ca7a19
 * PR#331: for Visual Studio, use a snprintf/vsnprintf wrapper that ensures the string is terminated.
 * Fix double to int cast overflow in json_object_get_int64.
 * Clamp double to int32 when narrowing in json_object_get_int.
 * Use strtoll() to parse ints - instead of sscanf
 * Miscellaneous smaller changes, including removing unused variables, fixing warning
  about uninitialized variables adding const qualifiers, reformatting code, etc...
 
 Build changes:
 --------------
 * Add Appveyor and Travis build support
 * Switch to using CMake when building on Windows with Visual Studio.
         A dynamic .dll is generated instead of a .lib
         config.h is now generated, config.h.win32 should no longer be manually copied
 * Add support for MacOS through CMake too.
 * Enable silent build by default
 * Link against libm when needed
 * Add support for building with AddressSanitizer
 * Add support for building with Clang
 * Add a --enable-threading configure option, and only use the (slower) __sync_add_and_fetch()/__sync_sub_and_fetch() function when it is specified.
 
 List of new functions added:
 ----------------------------
 ### json_object.h
 * array_list_bsearch()
 * array_list_del_idx()
 * json_object_to_json_string_length()
 * json_object_get_userdata()
 * json_object_set_userdata()
 * json_object_object_add_ex()
 * json_object_array_bsearch()
 * json_object_array_del_idx()
 * json_object_set_boolean()
 * json_object_set_int()
 * json_object_int_inc()
 * json_object_set_int64()
 * json_c_set_serialization_double_format()
 * json_object_double_to_json_string()
 * json_object_set_double()
 * json_object_set_string()
 * json_object_set_string_len()
 * json_object_equal()
 * json_object_deep_copy()
 
 ### json_pointer.h
 * json_pointer_get()
 * json_pointer_getf()
 * json_pointer_set()
 * json_pointer_setf()
 
 ### json_util.h
 * json_object_from_fd()
 * json_object_to_fd()
 * json_util_get_last_err()
 
 ### json_visit.h
 * json_c_visit()
 
 ### linkhash.h
 * json_global_set_string_hash()
 * lh_table_resize()
 
 ### printbuf.h
 * printbuf_strappend()
 
 
 0.12.1
 ======
 
   * Minimal changes to address compile issues.
 
 0.12
 ====
 
   * Address security issues:
     * CVE-2013-6371: hash collision denial of service
     * CVE-2013-6370: buffer overflow if size_t is larger than int
 
   * Avoid potential overflow in json_object_get_double
 
   * Eliminate the mc_abort() function and MC_ABORT macro.
 
   * Make the json_tokener_errors array local.  It has been deprecated for
      a while, and json_tokener_error_desc() should be used instead.
 
   * change the floating point output format to %.17g so values with
      more than 6 digits show up in the output.
 
   * Remove the old libjson.so name compatibility support.  The library is
       only created as libjson-c.so now and headers are only installed
       into the ${prefix}/json-c directory.
 
   * When supported by the linker, add the -Bsymbolic-functions flag.
 
   * Various changes to fix the build on MSVC.
 
   * Make strict mode more strict:
     * number must not start with 0
     * no single-quote strings
     * no comments
     * trailing char not allowed
     * only allow lowercase literals
 
   * Added a json_object_new_double_s() convenience function to allow
     an exact string representation of a double to be specified when
     creating the object and use it in json_tokener_parse_ex() so
     a re-serialized object more exactly matches the input.
 
   * Add support NaN and Infinity
 
 
 0.11
 ====
 
   * IMPORTANT: the name of the library has changed to libjson-c.so and
      the header files are now in include/json-c.
      The pkgconfig name has also changed from json to json-c.
      You should change your build to use appropriate -I and -l options.
      A compatibility shim is in place so builds using the old name will
      continue to work, but that will be removed in the next release.
   * Maximum recursion depth is now a runtime option.
      json_tokener_new() is provided for compatibility.
      json_tokener_new_ex(depth)
   * Include json_object_iterator.h in the installed headers.
   * Add support for building on Android.
   * Rewrite json_object_object_add to replace just the value if the key already exists so keys remain valid.
   * Make it safe to delete keys while iterating with the json_object_object_foreach macro.
   * Add a json_set_serializer() function to allow the string output of a json_object to be customized.
   * Make float parsing locale independent.
   * Add a json_tokener_set_flags() function and a JSON_TOKENER_STRICT flag.
   * Enable -Werror when building.
   * speed improvements to parsing 64-bit integers on systems with working sscanf
   * Add a json_object_object_length function.
   * Fix a bug (buffer overrun) when expanding arrays to more than 64 entries.
 
 0.10
 ====
 
   * Add a json_object_to_json_string_ext() function to allow output to be
      formatted in a more human readable form.
   * Add json_object_object_get_ex(), a NULL-safe get object method, to be able
      to distinguish between a key not present and the value being NULL.
   * Add an alternative iterator implementation, see json_object_iterator.h
   * Make json_object_iter public to enable external use of the
      json_object_object_foreachC macro.
   * Add a printbuf_memset() function to provide an effecient way to set and
      append things like whitespace indentation.
   * Adjust json_object_is_type and json_object_get_type so they return
       json_type_null for NULL objects and handle NULL passed to
       json_objct_object_get().
   * Rename boolean type to json_bool.
   * Fix various compile issues for Visual Studio and MinGW.
   * Allow json_tokener_parse_ex() to be re-used to parse multiple object.
      Also, fix some parsing issues with capitalized hexadecimal numbers and
      number in E notation.
   * Add json_tokener_get_error() and json_tokener_error_desc() to better
      encapsulate the process of retrieving errors while parsing.
   * Various improvements to the documentation of many functions.
   * Add new json_object_array_sort() function.
   * Fix a bug in json_object_get_int(), which would incorrectly return 0
     when called on a string type object.
     Eric Haszlakiewicz
   * Add a json_type_to_name() function.
     Eric Haszlakiewicz
   * Add a json_tokener_parse_verbose() function.
     Jehiah Czebotar
   * Improve support for null bytes within JSON strings.
     Jehiah Czebotar
   * Fix file descriptor leak if memory allocation fails in json_util
     Zachary Blair, zack_blair at hotmail dot com
   * Add int64 support. Two new functions json_object_net_int64 and
     json_object_get_int64. Binary compatibility preserved.
     Eric Haszlakiewicz, EHASZLA at transunion com
     Rui Miguel Silva Seabra, rms at 1407 dot org
   * Fix subtle bug in linkhash where lookup could hang after all slots
     were filled then successively freed.
     Spotted by Jean-Marc Naud, j dash m at newtraxtech dot com
   * Make json_object_from_file take const char *filename
     Spotted by Vikram Raj V, vsagar at attinteractive dot com
   * Add handling of surrogate pairs (json_tokener.c, test4.c, Makefile.am)
     Brent Miller, bdmiller at yahoo dash inc dot com
   * Correction to comment describing printbuf_memappend in printbuf.h
     Brent Miller, bdmiller at yahoo dash inc dot com
 
 0.9
 ===
   * Add README.html README-WIN32.html config.h.win32 to Makefile.am
     Michael Clark, <michael@metaparadigm.com>
   * Add const qualifier to the json_tokener_parse functions
     Eric Haszlakiewicz, EHASZLA at transunion dot com
   * Rename min and max so we can never clash with C or C++ std library
     Ian Atha, thatha at yahoo dash inc dot com
   * Fix any noticeable spelling or grammar errors.
   * Make sure every va_start has a va_end.
   * Check all pointers for validity.
     Erik Hovland, erik at hovland dot org
   * Fix json_object_get_boolean to return false for empty string
     Spotted by Vitaly Kruglikov, Vitaly dot Kruglikov at palm dot com
   * optimizations to json_tokener_parse_ex(), printbuf_memappend()
     Brent Miller, bdmiller at yahoo dash inc dot com
   * Disable REFCOUNT_DEBUG by default in json_object.c
   * Don't use this as a variable, so we can compile with a C++ compiler
   * Add casts from void* to type of assignment when using malloc
   * Add #ifdef __cplusplus guards to all of the headers
   * Add typedefs for json_object, json_tokener, array_list, printbuf, lh_table
     Michael Clark, <michael@metaparadigm.com>
   * Null pointer dereference fix. Fix json_object_get_boolean strlen test
     to not return TRUE for zero length string. Remove redundant includes.
     Erik Hovland, erik at hovland dot org
   * Fixed warning reported by adding -Wstrict-prototypes
     -Wold-style-definition to the compilatin flags.
     Dotan Barak, dotanba at gmail dot com
   * Add const correctness to public interfaces
     Gerard Krol, g dot c dot krol at student dot tudelft dot nl
 
 0.8
 ===
   * Add va_end for every va_start
     Dotan Barak, dotanba at gmail dot com
   * Add macros to enable compiling out debug code
     Geoffrey Young, geoff at modperlcookbook dot org
   * Fix bug with use of capital E in numbers with exponents
     Mateusz Loskot, mateusz at loskot dot net
   * Add stddef.h include
   * Patch allows for json-c compile with -Werror and not fail due to
     -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations
     Geoffrey Young, geoff at modperlcookbook dot org
 
 0.7
 ===
   * Add escaping of backslash to json output
   * Add escaping of foward slash on tokenizing and output
   * Changes to internal tokenizer from using recursion to
     using a depth state structure to allow incremental parsing
 
 0.6
 ===
   * Fix bug in escaping of control characters
     Johan Björklund, johbjo09 at kth dot se
   * Remove include "config.h" from headers (should only
     be included from .c files)
     Michael Clark <michael@metaparadigm.com>
 
 0.5
 ===
   * Make headers C++ compatible by change *this to *obj
   * Add ifdef C++ extern "C" to headers
   * Use simpler definition of min and max in bits.h
     Larry Lansing, llansing at fuzzynerd dot com
 
   * Remove automake 1.6 requirement
   * Move autogen commands into autogen.sh. Update README
   * Remove error pointer special case for Windows
   * Change license from LGPL to MIT
     Michael Clark <michael@metaparadigm.com>
 
 0.4
 ===
   * Fix additional error case in object parsing
   * Add back sign reversal in nested object parse as error pointer
     value is negative, while error value is positive.
     Michael Clark <michael@metaparadigm.com>
 
 0.3
 ===
   * fix pointer arithmetic bug for error pointer check in is_error() macro
   * fix type passed to printbuf_memappend in json_tokener
   * update autotools bootstrap instructions in README
     Michael Clark <michael@metaparadigm.com>
 
 0.2
 ===
   * printbuf.c - C. Watford (christopher.watford@gmail.com)
     Added a Win32/Win64 compliant implementation of vasprintf
   * debug.c - C. Watford (christopher.watford@gmail.com)
     Removed usage of vsyslog on Win32/Win64 systems, needs to be handled
     by a configure script
   * json_object.c - C. Watford (christopher.watford@gmail.com)
     Added scope operator to wrap usage of json_object_object_foreach, this
     needs to be rethought to be more ANSI C friendly
   * json_object.h - C. Watford (christopher.watford@gmail.com)
     Added Microsoft C friendly version of json_object_object_foreach
   * json_tokener.c - C. Watford (christopher.watford@gmail.com)
     Added a Win32/Win64 compliant implementation of strndup
   * json_util.c - C. Watford (christopher.watford@gmail.com)
     Added cast and mask to suffice size_t v. unsigned int conversion
     correctness
   * json_tokener.c - sign reversal issue on error info for nested object parse
     spotted by Johan Björklund (johbjo09 at kth.se)
   * json_object.c - escape " in json_escape_str
   * Change to automake and libtool to build shared and static library
     Michael Clark <michael@metaparadigm.com>
 
 0.1
 ===
   * initial release

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