* Add API for accessing incremental GC time limit with nanosecond precision
* Add I_HOLD_LOCK assertion to expand_hp_inner and related functions
+* Add testing of GC_CALLOC/MALLOC_EXPLICITLY_TYPED (gctest)
* Adjust formatting of numbered lists in README.md to match other .md files
* Adjust highlighting of API prototypes in gcinterface.md
* Adjust printf calls in gctest check_heap_stats so that each has new-line
+* Allow incremental GC on Cygwin
+* Allow memory unmapping in case of MPROTECT_VDB
* Eliminate 'hash_val value is never used' cppcheck false positive
* Eliminate 'stop variable is always 0' compiler warning in print_callers
* Enable compilation without C runtime (Win32)
* Remove goto statement in print_callers (code refactoring)
* Remove redundant options for building 'cord' in gc.mak
* Remove redundant type casts in backgraph HEIGHT_UNKNOWN/IN_PROGRESS
+* Remove unused STACK_GRAN macro definitions (code refactoring)
* Remove unused sparc_sunos4_mach_dep.s file
* Replace "msecs" with "ms" in all comments and messages
* Report time with a nanosecond precision where available