class DEBUGGER__::Session

def on_thread_begin th

Experimental RBS support (using type sampling data from the type_fusion project). 

def on_thread_begin: (Thread th) -> DEBUGGER__::ThreadClient

This signature was generated using 7 samples from 3 applications. 

def on_thread_begin th
  if @th_clients.has_key? th
    # TODO: NG?
  else
    create_thread_client th
  end
end