Boxing and unboxing

boxing

import com.azavea.math.Numeric
import com.azavea.math.EasyImplicits._

class Blah[@specialized T:Numeric:Manifest] {
 def blah[@specialized W:Numeric:Manifest](f:Function1[T,W]):W  = {  
  f(numeric[T].zero)
}
 def blah2(f:Function[T,T]):T = {
    f(numeric[T].zero)
 }
}


javap -verbose Blah\$mcI\$sp
public java.lang.Object blah$mcI$sp(scala.Function1, com.azavea.math.Numeric, scala.reflect.Manifest);
  Code:
   Stack=3, Locals=4, Args_size=4
   0:	aload_1
   1:	getstatic	#32; //Field com/azavea/math/EasyImplicits$.MODULE$:Lcom/azavea/math/EasyImplicits$;
   4:	aload_0
   5:	getfield	#34; //Field evidence$15$mcI$sp:Lcom/azavea/math/Numeric;
   8:	invokevirtual	#38; //Method com/azavea/math/EasyImplicits$.numeric$mIc$sp:(Lcom/azavea/math/Numeric;)Lcom/azavea/math/Numeric;
   11:	invokeinterface	#44,  1; //InterfaceMethod com/azavea/math/Numeric.zero$mcI$sp:()I
   16:	invokestatic	#50; //Method scala/runtime/BoxesRunTime.boxToInteger:(I)Ljava/lang/Integer;
   19:	invokeinterface	#56,  2; //InterfaceMethod scala/Function1.apply:(Ljava/lang/Object;)Ljava/lang/Object;
   24:	areturn


public int blah2$mcI$sp(scala.Function1);
  Code:
   Stack=3, Locals=2, Args_size=2
   0:	aload_1
   1:	getstatic	#32; //Field com/azavea/math/EasyImplicits$.MODULE$:Lcom/azavea/math/EasyImplicits$;
   4:	aload_0
   5:	getfield	#34; //Field evidence$15$mcI$sp:Lcom/azavea/math/Numeric;
   8:	invokevirtual	#38; //Method com/azavea/math/EasyImplicits$.numeric$mIc$sp:(Lcom/azavea/math/Numeric;)Lcom/azavea/math/Numeric;
   11:	invokeinterface	#44,  1; //InterfaceMethod com/azavea/math/Numeric.zero$mcI$sp:()I
   16:	invokeinterface	#66,  2; //InterfaceMethod scala/Function1.apply$mcII$sp:(I)I
   21:	ireturn