When adding tests to support the specification claim introduced here, it turns out that two existent tests are actually failing in the master:
99% tests passed, 2 tests failed out of 203
Total Test time (real) = 1.13 sec
The following tests FAILED:
168 - min_supported_key_length (Failed)
169 - min_supported_value_length (Failed)
CC: @xuhdev @cxw42