One test fails:

    ok 91 - mp_read_double(mp_encode_float(6.565e6)) check result
    ok 92 - mp_read_double(mp_encode_double(-5.555)) check success
    ok 93 - mp_read_double(mp_encode_double(-5.555)) check pos advanced
    not ok 94 - mp_read_double(mp_encode_double(-5.555)) check result
        # Looks like you failed 1 test of 96 run.
    #   Failed test 'subtests'
    #   in /home/buildozer/aports/testing/msgpuck/src/msgpuck-2.0/test/test.c at line 85
    # Looks like you failed 1 test of 20 run.
    ok 95 - mp_read_double(mp_encode_strl(100)) check fail
    ok 96 - mp_read_double(mp_encode_strl(100)) check pos unchanged
    # *** test_numbers: done ***
    not ok 19 - subtests

Reported to upstream: https://github.com/rtsisyk/msgpuck/issues/17