The Bits class in boltons/mathutils.py does not correctly handle empty (zero-length) bit sequences across…

The Bits class in boltons/mathutils.py does not correctly handle empty (zero-length) bit sequences across…: a task in repo2rlenv-swe-gen (Harbor dataset). All empty Bits values (however constructed) must compare equal to each other, have len() == 0 , and round-trip through every conversion path: