[Bug-apl] The ' 2 ⎕TF ' bug

[Christian Robert]

      var←'kelvin' (,'v') 'some text'
      D var
┌3───────────────────────┐
│┌6─────┐ ┌→┐ ┌9────────┐│
││kelvin│ │v│ │some text││
│└──────┘ └─┘ └─────────┘│
└∊───────────────────────┘
      2 ⎕tf 'var'
var←'kelvin' 'v' 'some text'
      ⍎2 ⎕tf 'var'
      D var
┌3─────────────────────┐
│┌6─────┐ v ┌9────────┐│
││kelvin│   │some text││
│└──────┘   └─────────┘│
└∊─────────────────────┘
      ⍝ Length 1 vectors ( here (,'v') ) have been converted to scalar 'v'