anchor.diff:          | InvokeBinOpStatic op8 (r:uint32) -> box r
           | InvokeBinOpStatic op9 (r:uint64) -> box r
           | InvokeBinOpStatic op10 (r:unativeint) -> box r
  -        | InvokeBinOpStatic op11 (r:float) -> box r
  -        | InvokeBinOpStatic op12 (r:float32) -> box r
  -        | InvokeBinOpStatic op13 (r:decimal) -> box r
  -        | InvokeBinOpStatic op14 (r:bigint) -> box r
  -        | _ -> 
  -            match op_string with
  -            | Some(op) -> 
  -                match aty, x, y with
  -                | InvokeBinOpStatic op (r:string) -> box r
  -                | _ -> dyn()
  -            | _ -> dyn()
  +        | InvokeBinOpStatic op11 (r:bigint) -> box r
  +        | InvokeOptionalBinOpStatic op12 (r:float) -> box r
  +        | InvokeOptionalBinOpStatic op13 (r:float32) -> box r
  +        | InvokeOptionalBinOpStatic op14 (r:decimal) -> box r
  +        | InvokeOptionalBinOpStatic op15 (r:string) -> box r
  +        | _ -> dyn()
       else dyn()
   
  -let op_Addition = invokeNumericBinOp "op_Addition" (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (Some(+)) //dynamic impl is given in F# lib, but we implement ourselves for perf. gain
  -let op_Multiply = invokeNumericBinOp "op_Multiply" (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) None
  -let op_Subtraction = invokeNumericBinOp "op_Subtraction" (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) None
  -let op_Division = invokeNumericBinOp "op_Division" (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) None
  -let op_Modulus = invokeNumericBinOp "op_Modulus" (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) None
  -
  -let op_BitwiseOr (aty:Type) (bty:Type) (cty:Type) (x:obj) (y:obj) : obj = 
  -    let dyn() = invokeBinOpDynamic "op_BitwiseOr" aty bty x y                        
  -    if aty.Equals(bty) && bty.Equals(cty) then
  -        if aty.Equals(typeof<sbyte>)        then box ((unbox<sbyte> x)      ||| (unbox<sbyte> y))
  -        elif aty.Equals(typeof<int16>)      then box ((unbox<int16> x)      ||| (unbox<int16> y))
  -        elif aty.Equals(typeof<int32>)      then box ((unbox<int32> x)      ||| (unbox<int32> y))
  -        elif aty.Equals(typeof<int64>)      then box ((unbox<int64> x)      ||| (unbox<int64> y))
  -        elif aty.Equals(typeof<nativeint>)  then box ((unbox<nativeint> x)  ||| (unbox<nativeint> y))
  -        elif aty.Equals(typeof<byte>)       then box ((unbox<byte> x)       ||| (unbox<byte> y))
  -        elif aty.Equals(typeof<uint16>)     then box ((unbox<uint16> x)     ||| (unbox<uint16> y))
  -        elif aty.Equals(typeof<uint32>)     then box ((unbox<uint32> x)     ||| (unbox<uint32> y))
  -        elif aty.Equals(typeof<uint64>)     then box ((unbox<uint64> x)     ||| (unbox<uint64> y))
  -        elif aty.Equals(typeof<unativeint>) then box ((unbox<unativeint> x) ||| (unbox<unativeint> y))
  -        elif aty.Equals(typeof<bigint>)     then box ((unbox<bigint> x)     ||| (unbox<bigint> y))
  -//        elif aty.Equals(typeof<float>)      then box ((unbox<float> x)      ||| (unbox<float> y))
  -//        elif aty.Equals(typeof<float32>)    then box ((unbox<float32> x)    ||| (unbox<float32> y))
  -        else dyn()
  -    else dyn()
  -
  -let op_BitwiseAnd (aty:Type) (bty:Type) (cty:Type) (x:obj) (y:obj) : obj = 
  -    let dyn() = invokeBinOpDynamic "op_BitwiseAnd" aty bty x y
  -    if aty.Equals(bty) && bty.Equals(cty) then
  -        if aty.Equals(typeof<sbyte>)        then box ((unbox<sbyte> x)      &&& (unbox<sbyte> y))
  -        elif aty.Equals(typeof<int16>)      then box ((unbox<int16> x)      &&& (unbox<int16> y))
  -        elif aty.Equals(typeof<int32>)      then box ((unbox<int32> x)      &&& (unbox<int32> y))
  -        elif aty.Equals(typeof<int64>)      then box ((unbox<int64> x)      &&& (unbox<int64> y))
  -        elif aty.Equals(typeof<nativeint>)  then box ((unbox<nativeint> x)  &&& (unbox<nativeint> y))
  -        elif aty.Equals(typeof<byte>)       then box ((unbox<byte> x)       &&& (unbox<byte> y))
  -        elif aty.Equals(typeof<uint16>)     then box ((unbox<uint16> x)     &&& (unbox<uint16> y))
  -        elif aty.Equals(typeof<uint32>)     then box ((unbox<uint32> x)     &&& (unbox<uint32> y))
  -        elif aty.Equals(typeof<uint64>)     then box ((unbox<uint64> x)     &&& (unbox<uint64> y))
  -        elif aty.Equals(typeof<unativeint>) then box ((unbox<unativeint> x) &&& (unbox<unativeint> y))
  -        elif aty.Equals(typeof<bigint>)     then box ((unbox<bigint> x)     &&& (unbox<bigint> y))
  -//        elif aty.Equals(typeof<float>)      then box ((unbox<float> x)      &&& (unbox<float> y))
  -//        elif aty.Equals(typeof<float32>)    then box ((unbox<float32> x)    &&& (unbox<float32> y))
  -        else dyn()
  -    else dyn()
  -
  -let op_ExclusiveOr (aty:Type) (bty:Type) (cty:Type) (x:obj) (y:obj) : obj = 
  -    let dyn() = invokeBinOpDynamic "op_ExclusiveOr" aty bty x y
  -    if aty.Equals(bty) && bty.Equals(cty) then
  -        if aty.Equals(typeof<sbyte>)        then box ((unbox<sbyte> x)      ^^^ (unbox<sbyte> y))
  -        elif aty.Equals(typeof<int16>)      then box ((unbox<int16> x)      ^^^ (unbox<int16> y))
  -        elif aty.Equals(typeof<int32>)      then box ((unbox<int32> x)      ^^^ (unbox<int32> y))
  -        elif aty.Equals(typeof<int64>)      then box ((unbox<int64> x)      ^^^ (unbox<int64> y))
  -        elif aty.Equals(typeof<nativeint>)  then box ((unbox<nativeint> x)  ^^^ (unbox<nativeint> y))
  -        elif aty.Equals(typeof<byte>)       then box ((unbox<byte> x)       ^^^ (unbox<byte> y))
  -        elif aty.Equals(typeof<uint16>)     then box ((unbox<uint16> x)     ^^^ (unbox<uint16> y))
  -        elif aty.Equals(typeof<uint32>)     then box ((unbox<uint32> x)     ^^^ (unbox<uint32> y))
  -        elif aty.Equals(typeof<uint64>)     then box ((unbox<uint64> x)     ^^^ (unbox<uint64> y))
  -        elif aty.Equals(typeof<unativeint>) then box ((unbox<unativeint> x) ^^^ (unbox<unativeint> y))
  -        elif aty.Equals(typeof<bigint>)     then box ((unbox<bigint> x)     ^^^ (unbox<bigint> y))
  -//        elif aty.Equals(typeof<float>)      then box ((unbox<float> x)      ^^^ (unbox<float> y))
  -//        elif aty.Equals(typeof<float32>)    then box ((unbox<float32> x)    ^^^ (unbox<float32> y))
  -        else dyn()
  -    else dyn()
  -
  -let op_LeftShift (aty:Type) (bty:Type) (cty:Type) (x:obj) (y:obj) : obj = 
  -    let dyn() = invokeBinOpDynamic "op_LeftShift" aty bty x y
  -    if aty.Equals(bty) && bty.Equals(cty) then
  -        if aty.Equals(typeof<sbyte>)        then box ((unbox<sbyte> x)      <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<int16>)      then box ((unbox<int16> x)      <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<int32>)      then box ((unbox<int32> x)      <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<int64>)      then box ((unbox<int64> x)      <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<nativeint>)  then box ((unbox<nativeint> x)  <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<byte>)       then box ((unbox<byte> x)       <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<uint16>)     then box ((unbox<uint16> x)     <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<uint32>)     then box ((unbox<uint32> x)     <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<uint64>)     then box ((unbox<uint64> x)     <<< (unbox<int32> y))
  -        elif aty.Equals(typeof<unativeint>) then box ((unbox<unativeint> x) <<< (unbox<int32> y))
  -//        elif aty.Equals(typeof<float>)      then box ((unbox<float> x)      <<< (unbox<float> y))
  -//        elif aty.Equals(typeof<float32>)    then box ((unbox<float32> x)    <<< (unbox<float32> y))
  -        else dyn()
  -    else dyn()
  -
  -let op_RightShift (aty:Type) (bty:Type) (cty:Type) (x:obj) (y:obj) : obj = 
  -    let dyn() = invokeBinOpDynamic "op_RightShift" aty bty x y
  -    if aty.Equals(bty) && bty.Equals(cty) then
  -        if aty.Equals(typeof<sbyte>)        then box ((unbox<sbyte> x)      >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<int16>)      then box ((unbox<int16> x)      >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<int32>)      then box ((unbox<int32> x)      >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<int64>)      then box ((unbox<int64> x)      >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<nativeint>)  then box ((unbox<nativeint> x)  >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<byte>)       then box ((unbox<byte> x)       >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<uint16>)     then box ((unbox<uint16> x)     >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<uint32>)     then box ((unbox<uint32> x)     >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<uint64>)     then box ((unbox<uint64> x)     >>> (unbox<int32> y))
  -        elif aty.Equals(typeof<unativeint>) then box ((unbox<unativeint> x) >>> (unbox<int32> y))
  -//        elif aty.Equals(typeof<float>)      then box ((unbox<float> x)      >>> (unbox<float> y))
  -//        elif aty.Equals(typeof<float32>)    then box ((unbox<float32> x)    >>> (unbox<float32> y))
  -        else dyn()
  -    else dyn()
  +let op_Addition = invokeNumericBinOp "op_Addition" (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (Some(+)) (Some(+)) (Some(+)) (Some(+)) //dynamic impl is given in F# lib, but we implement ourselves for perf. gain
  +let op_Multiply = invokeNumericBinOp "op_Multiply" (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (Some(*)) (Some(*)) (Some(*)) None
  +let op_Subtraction = invokeNumericBinOp "op_Subtraction" (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (Some(-)) (Some(-)) (Some(-)) None
  +let op_Division = invokeNumericBinOp "op_Division" (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) (/) (Some(/)) (Some(/)) (Some(/)) None
  +let op_Modulus = invokeNumericBinOp "op_Modulus" (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (Some(%)) (Some(%)) (Some(%)) None
  +
  +let op_BitwiseOr = invokeNumericBinOp "op_BitwiseOr" (|||) (|||) (|||) (|||) (|||) (|||) (|||) (|||) (|||) (|||) (|||) None None None None
  +let op_BitwiseAnd = invokeNumericBinOp "op_BitwiseAnd" (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) None None None None
  +let op_ExclusiveOr = invokeNumericBinOp "op_ExclusiveOr" (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) None None None None
  +let op_LeftShift = invokeNumericBinOp "op_LeftShift" (<<<) (<<<) (<<<) (<<<) (<<<) (<<<) (<<<) (<<<) (<<<) (<<<) (<<<) None None None None
  +let op_RightShift = invokeNumericBinOp "op_RightShift" (>>>) (>>>) (>>>) (>>>) (>>>) (>>>) (>>>) (>>>) (>>>) (>>>) (>>>) None None None None
   
   let binOpLookup : System.Collections.Generic.IDictionary<string, (Type->Type->Type->obj->obj->obj)> = 
       dict
  
positive.code:     | null -> raise (NotSupportedException ())
      | m -> m.Invoke(null,[| x |])
  
  let inline (|InvokeBinOpStatic|_|) (op:'a->'a->'a) (aty:Type, x:obj, y:obj) =
      if aty.Equals(typeof<'a>) then Some(op (unbox<'a> x) (unbox<'a> y))
      else None
  
  let inline invokeNumericBinOp 
      name 
      op1 op2 op3 op4 op5 op6 op7 op8 op9 op10 op11 op12 op13 op14
      (op_string:(string -> string -> string) option) //for string "addition"
      (aty:Type) (bty:Type) (cty:Type) (x:obj) (y:obj) : obj =
      let dyn() = invokeBinOpDynamic name aty bty x y
      if aty.Equals(bty) && bty.Equals(cty) then
  
negative.code: 
  module Checked =
      open Checked
      let op_Addition = invokeNumericBinOp "op_Addition" (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (Some(+)) (Some(+)) (Some(+)) (Some(+)) //dynamic impl is given in F# lib, but we implement ourselves for perf. gain
      let op_Multiply = invokeNumericBinOp "op_Multiply" (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (Some(*)) (Some(*)) (Some(*)) None
      let op_Subtraction = invokeNumericBinOp "op_Subtraction" (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (Some(-)) (Some(-)) (Some(-)) None
  
      let binOpLookup : System.Collections.Generic.IDictionary<string, (Type->Type->Type->obj->obj->obj)> = 
          dict
  