anchor.diff:      | Property = 112uy
       | Counts = 116uy
   
  -type EGTEntry =
  +type Entry =
       | Empty
       | Byte of byte
       | Boolean of bool
  
positive.code:     | String of string
  
  /// What can go wrong with reading an EGT file.
  type EGTError =
      /// A [sequence error](Farkle.SeqError) did happen.
      | SeqError of SeqError
      /// Boolean values should only be `0` or `1`.
  
negative.code:     /// Valid entry codes are these letters: `EbBIS`.
      | InvalidEntryCode of char
      /// An entry of `expected` type was requested, but `found` was returned instead.
      | InvalidEntryType of expected: string * found: Entry
  
  module EgtReader =
      let byteToChar = (*) 1uy >> char
  