code: function Me(ct,pt,ut){// Remove trailing zeros.
  for(var bt=1,ht=pt.length;!pt[--ht];pt.pop());// Calculate the base 10 exponent. First get the number of digits of c[0].
  for(ht=pt[0];10<=ht;ht/=10,bt++);// Overflow?
  return(ut=bt+ut*Pe-1)>Qe?ct.c=ct.e=null:ut<Ze?ct.c=[ct.e=0]:(ct.e=ut,ct.c=pt),ct}
docs: /*
  Strip trailing zeros, calculate base 10 exponent and check against MIN_EXP and MAX_EXP.
  Called by minus, plus and times.