issue with "compliling" code with Math expressions

Ok - try now!

Turns out it was two issues :)

• On nRF52 (which I was using initially) we switched to use the FPU a while back and that messed up how doubles are passed - so code using doubles didn't work reliably. But you wouldn't have hit that (probably the code above would have worked fine on the original Espruino)
  
• The type handling of the unary minus (for -8.0) was wrong - and I think that's what hit you
  
  

Running:

function F(x){
"compiled";
return 1/(1.13+Math.exp(-8.0*(x-0.54)))+0.14;
}
function G(x){
return 1/(1.13+Math.exp(-8.0*(x-0.54)))+0.14;
}
for (var i=0;i<10;i++) {
  print(F(i),G(i));
}

Now shows the right values for me