code: function deltaEncTypeInt( fromType, toType ) {
  	// Lookup conversion on the downscale table
  	for (var i=0; i<NUMTYPE_DELTA_INT.FROM.length; ++i) {
  		if ( (NUMTYPE_DELTA_INT.FROM[i] === fromType) && 
  			 (NUMTYPE_DELTA_INT.TO[i] === toType) )
  			return i;
  	}
  	// Nothing found
  	return undefined;
  }
docs: Pick a matching delta encoding delta for integers