Setting `Method` property to something other than `'get'` results in endless loop

[e9gille]

Well this is a bit awkward. I found this to be an issue in version 5.9.1, but looking at the repo here in GitHub I can't find the lines that cause the problem, so in addition there's a discrepancy between what was published as version 5.9.1 on Tatin and GitHub. In the Tatin version, these additional lines are causing the issue:

    :field public Method←'get'                     ⍝ synonym for Command
    ∇ UpdateCommandMethod arg
      :Implements Trigger Command,Method
      :If (Command Method)∨.≢⊂arg.NewValue
          Command←Method←arg.NewValue
      :EndIf
    ∇