Since it took me a while to track this down, I'll share the actual source of the problem - the completion script removes the '=' character from COMP_WORDBREAKS
COMP_WORDBREAKS=${COMP_WORDBREAKS/=/}
Since it took me a while to track this down, I'll share the actual source of the problem - the completion script removes the '=' character from COMP_WORDBREAKS
COMP_WORDBREAKS =${COMP_ WORDBREAKS/ =/}