Would TCAS ever issue a "climb, climb!" RA that would stall a jet with a low airspeed?
The FAA publishes Advisory Circular 20-151A, which says in section 2-17(a):


  Because TCAS II can only accept a limited number of inputs related to
  airplane performance, it’s not possible to automatically inhibit CLIMB
  and INCREASE CLIMB RAs in all cases where it may be appropriate to
  inhibit such RAs. In these cases, TCAS II may command maneuvers that
  may significantly reduce stall margins or result in stall warning