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textvariable: support for Tk -textvariable option

type textVariable
TextVariable is an abstract type
value create : unit -> textVariable
Allocation of a TextVariable
value   create_temporary : widget -> textVariable
Allocation of a textVariable with lifetime associated to widget
value   set : textVariable -> string -> unit
Setting the value of a TextVariable
value   get : textVariable -> string
Reading the value of a TextVariable
value   name : textVariable -> string
Its tcl name
value cCAMLtoTKtextVariable : textVariable -> tkArgs
Internal conversion function


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