Bryce Adelstein Lelbach, the ISO C++ Library evolution chair, says that he would rather be consistently wrong than inconsistently right. Maybe that's what the P

Bryce Adelstein Lelbach, the ISO C++ Library evolution chair, says that he would rather be consistently wrong than inconsistently right. Maybe that's what the Python core team thought, "we'd better make this consistent with +=, whose quirks people already know".