anchor.diff:  
   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 op_Addition = invokeBinOp "op_Addition" (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (+) (Some(+)) (Some(+)) (Some(+)) (Some(+)) //dynamic impl is given in F# lib, but we implement ourselves for perf. gain
  +    let op_Multiply = invokeBinOp "op_Multiply" (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (*) (Some(*)) (Some(*)) (Some(*)) None
  +    let op_Subtraction = invokeBinOp "op_Subtraction" (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (-) (Some(-)) (Some(-)) (Some(-)) None
   
       let binOpLookup : System.Collections.Generic.IDictionary<string, (Type->Type->Type->obj->obj->obj)> = 
           dict
  
positive.code:         | _ -> 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
  
negative.code:          ("op_LeftShift",op_LeftShift)
           ("op_RightShift",op_RightShift)]
  
  ///name is the name of the unary op method, aty is the arg type, x is the arg
  let invokeUnaryOpDynamic name (aty:Type) (x:obj) =
      let ameth = aty.GetMethod(name,[| aty |])
      match ameth  with 
      | null -> raise (NotSupportedException ())
      | m -> m.Invoke(null,[| x |])
  
  let inline (|InvokeUnaryOpStatic|_|) (op:'a->'a) (aty:Type, x:obj) =
      if aty.Equals(typeof<'a>) then Some(op (unbox<'a> x))
      else None
  
  let inline (|InvokeOptionalUnaryOpStatic|_|) (op:('a->'a) option) (aty:Type, x:obj) =
      match op with
      | Some(op) when aty.Equals(typeof<'a>) -> Some(op (unbox<'a> x))
      | _ -> None
  
  let inline invokeUnaryOp 
      name 
      op1 op2 op3 op4 op5 op6 op7 op8 op9 op10
      op11 op12 op13 op14 //unsigned types (which includes byte) not always supported
      (aty:Type) (bty:Type) (x:obj) : obj =
      let dyn() = invokeUnaryOpDynamic name aty x
      if aty.Equals(bty) then
          match aty, x with
          | InvokeUnaryOpStatic op1 (r:sbyte) -> box r
          | InvokeUnaryOpStatic op2 (r:int16) -> box r 
          | InvokeUnaryOpStatic op3 (r:int32) -> box r
          | InvokeUnaryOpStatic op4 (r:int64) -> box r
          | InvokeUnaryOpStatic op5 (r:nativeint) -> box r
          | InvokeUnaryOpStatic op6 (r:bigint) -> box r
          | InvokeUnaryOpStatic op7 (r:float) -> box r
          | InvokeUnaryOpStatic op8 (r:float32) -> box r
          | InvokeUnaryOpStatic op9 (r:decimal) -> box r
          | InvokeOptionalUnaryOpStatic op10 (r:byte) -> box r
          | InvokeOptionalUnaryOpStatic op11 (r:uint16) -> box r
          | InvokeOptionalUnaryOpStatic op12 (r:uint32) -> box r
          | InvokeOptionalUnaryOpStatic op13 (r:uint64) -> box r
          | InvokeOptionalUnaryOpStatic op14 (r:unativeint) -> box r
          | _ -> dyn()
      else dyn()
  
  let op_UnaryPlus = invokeUnaryOp "op_UnaryPlus" (~+) (~+) (~+) (~+) (~+) (~+) (~+) (~+) (~+) (Some(~+)) (Some(~+)) (Some(~+)) (Some(~+)) (Some(~+))
  let op_UnaryNegation = invokeUnaryOp "op_UnaryNegation" (~-) (~-) (~-) (~-) (~-) (~-) (~-) (~-) (~-) None None None None None
  
  let ToByte (aty:Type) (bty:Type) (x:obj) : obj =
      if aty.Equals(typeof<string>)       then box (byte (unbox<string> x))
  