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tip of master built on current macOS 10.14 - correct results:

3.8.0a2+ (heads/master:f45813df52, Mar 12 2019, 12:25:58)
[Clang 10.0.0 (clang-1000.11.45.5)]
macOS-10.14.3-x86_64-i386-64bit
monotonic: namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)
perf_counter: namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)
process_time: namespace(adjustable=False, implementation='clock_gettime(CLOCK_PROCESS_CPUTIME_ID)', monotonic=True, resolution=1.0000000000000002e-06)
thread_time: namespace(adjustable=False, implementation='clock_gettime(CLOCK_THREAD_CPUTIME_ID)', monotonic=True, resolution=1e-09)
time: namespace(adjustable=True, implementation='clock_gettime(CLOCK_REALTIME)', monotonic=False, resolution=1.0000000000000002e-06)
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v3.8.0a2 python.org installer built on macOS 10.9 - INCORRECT results:

3.8.0a2 (v3.8.0a2:23f4589b4b, Feb 25 2019, 10:59:08)
[Clang 6.0 (clang-600.0.57)]
macOS-10.14.3-x86_64-i386-64bit
monotonic: namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)
perf_counter: namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)
process_time: namespace(adjustable=False, implementation='getrusage(RUSAGE_SELF)', monotonic=True, resolution=1e-06)
thread_time: not available
time: namespace(adjustable=True, implementation='gettimeofday()', monotonic=False, resolution=1e-06)
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v3.6.8 python.org installer built on macOS 10.9 - correct results:

3.6.8 (v3.6.8:3c6b436a57, Dec 24 2018, 02:04:31)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)]
Darwin-18.2.0-x86_64-i386-64bit
monotonic: namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)
perf_counter: namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)
process_time: namespace(adjustable=False, implementation='getrusage(RUSAGE_SELF)', monotonic=True, resolution=1e-06)
thread_time: not available
time: namespace(adjustable=True, implementation='gettimeofday()', monotonic=False, resolution=1e-06)
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