Should taxpayers underwrite special benefits to attract new teachers, such as affordable housing, expanded maternity leave and tax breaks? California lawmakers have put forward a raft of proposals offering extra perks for teachers this session, prompted by what supporters say is an urgent need to do more to encourage people to get into the profession or stay there. “Due to the extreme shortage of teachers in the state, many school districts must seek opportunities to attract qualified teachers,” Assemblyman Kevin Mullin, D-South San Francisco, said of his bill meant to increase the supply of affordable housing for teachers. Available data, though, doesn’t back up such dire assessments of the state’s overall teacher supply. Data shows that, as state finances have improved, so have the number of teachers in public schools.