anchor.diff:  |
   [options="header"]
   !====
  -! a    ! ax   ! b    ! c
  -! true ! true ! null ! true
  +! a      ! ax     ! b      ! c
  +! `true` ! `true` ! `null` ! `true`
   !====
   
   |
  
positive.code: |
  [options="header"]
  !====
  ! a ! b ! c
  ! 3 ! 3 ! 5
  !====
  
  |
  
negative.code: |
  [options="header"]
  !====
  ! a      ! ax     ! b       ! c
  ! `true` ! `true` ! `false` ! `false`
  !====
  
  |
  