Is a defendant required to prove he would not have entered a plea if he had known the lifetime parole term was included in the plea?

As the majority concede, defendant is not required to establish he would not have entered the plea if he had known of the lifetime parole term in order to claim a violation of the bargain. (People v. Walker, supra, 54 Cal.3d at p. 1026, 1 Cal.Rptr.2d 902, 819 P.2d 861.) He need only show that the court proposes to add a significant term of punishment to the bargained-for term. (Ibid.) "A court may not impose punishment significantly greater than that bargained for by finding the defendant would have agreed to the greater punishment had it been made a part of the plea offer. 'Because a court can only speculate why a defendant would negotiate for a particular term of a bargain, implementation should not be contingent on others' assessment of the value of the term to defendant....' " (Ibid.)