I'm in the middle of exploring the new core, I noticed the function attachInterrupt is short a few lines.
I realise the core is in beta, just not sure weather its known as the function isn't marked with a comment.
void attachInterrupt( uint32_t ulInterrupt, void (*pfn_UserFunc)(void), uint32_t ulMode )
{
if ( ulInterrupt < EXTERNAL_NUM_INTERRUPTS )
{
g_apfn_IntFunc[ulInterrupt] = pfn_UserFunc ;
// Configure the interrupt mode (trigger on low input, any change, rising
// edge, or falling edge). The mode constants were chosen to correspond
// to the configuration bits in the hardware register, so we simply shift
// the mode into place.
// Enable the interrupt.
}
}