C types interchangeability with Julia types

I wrote a wrapper of C library. Here is one of C functions:

extern "C" bool start(char* nodeName)

and Julia equivalent:

export start

function start(nodeName::String)
  ccall((:start, "libsimc.so"), Bool, (Cstring,), nodeName)   

Rereading the manual, I noticed that ccall should really be written as:

ccall((:start, "libsimc.so"), Cuchar, (Cstring,), nodeName) 

i.e. Cuchar instead of Bool. Cuchar and Bool are both represented by one byte, but the types seem to be unrelated. Was I just lucky that my implementation seemed to work?