In March .1991 appellee Brian A. Pettiford (hereinafter, defendant) was convicted of being a felon-in-possession of a firearm in violation. of 18 U.S.C. § 922(g)(1). Because he had nine prior .state convictions for violent felonies, he received a minimum mandatory sentence of fifteen years pursuant to the Armed Career Criminal Act (“ACCA”), 18 U.S.C. § 924(e)(1). In 1994, all but one of. the prior convictions were vacated by the Massachusetts state courts, and in 1995 the district court granted federal habeas corpus relief under 28 U.S.C. § 2255 in the form of a sentence reduction, on the ground that the ACCA was now inapplicable to the computation. On the government’s appeal, we affirm.

I. Background

Approximately two years after his federal sentencing, defendant requested audiotapes of his earlier guilty pleas and sentencings in Boston Municipal Court and Dorchester District Court. He was unsuccessful in obtaining useful tapes, post, and subsequently attempted to reconstruct the proceedings through the use of affidavits. Ultimately, the courts vacated eight of the nine convictions. The Boston Municipal Court’judge, finding no record that the trial judge had engaged in any colloquy with the defendant at the time of his guilty plea, vacated the convictions on the ground that the Commonwealth had failed to carry its burden of producing a “contemporaneous record affirmatively [showing] that the defendant waived his rights voluntarily and knowingly,” as required under the federal Constitution and Massachusetts law. The Dorchester District Court apparently did the same. On the ha-beas petition, our district court, taking what would, initially, seem to us the equitable view, granted the relief and resentenced defendant to the term served, four and one half years.

The government appeals, and with indignation: the state action had been a “windfall;” the government had been “sandbagged.” In view of the fact that the mandatory enhancement was based entirely upon the state’s action in convicting, ^[1] and not simply a case where enhancement is permitted for charges with no findings, see, e.g., U.S.S.G. § 4A1.3(e), to complain of state windfalls and government sandbagging is strong language. The government criticizes the state’s procedure as if the vacated convictions were federal property, and the defendant as if he were attempting a trespass. We are induced to start with the opposite approach. First, however, we must consider a Supreme Court case, Custis v. United States, 511 U.S. 485, 114 S.Ct. 1732, 128 L.Ed.2d 517 (1994), decided after the imposition of defendant’s original sentence and its affirmance on appeal, United States v. Pettiford, 962 F.2d 74 (1st Cir.1992).

II. United States v. Custis

In May 1994, the Supreme Court in Custis held that under § 924(e), unless a defendant in a federal sentencing proceeding was claiming a violation of his right to counsel, he had no right at that time to make a collateral attack on prior state convictions. 511 U.S. at -, 114 S.Ct. at 1738. Rather, the Court observed at the end of the opinion,

We recognize, however, as did the Court of Appeals ... that Custis, who was still “in custody” for purposes of his state convictions at the time of his federal sentencing under § 924(e), may attack his state sentences in Maryland or through federal habeas review. See Maleng v. Cook, 490 U.S. 488, 109 S.Ct. 1923, 104 L.Ed.2d 540 (1989). If Custis is successful in attacking these state sentences, he may then apply for reopening of any federal sentence enhanced by the state sentences. We ex[*201] press no opinion on the appropriate disposition of such an application.

Id. at -, 114 S.Ct. at 1739. The district court, noting this dicta, held, in an extensive opinion, Pettiford v. United States, 1995 WL 464920 (D.Mass.1995), that defendant’s enhanced federal sentence was now in violation of the Constitution. The government has a variety of objections.

III.Jurisdiction

The district court concluded from the Custis dicta that § 2255 was the appropriate vehicle by which to proceed. The government objects on the ground that this section applies only to prisoners incarcerated “in violation of the Constitution or laws of the United States.” While we believe, post, that defendant has such a claim, the government’s attempt to limit the availability of § 2255 that permeates its case, is surprising. Section 2255 reads as follows:

A prisoner in custody under sentence of a court established by Act of Congress claiming the right to be released upon the ground that [1] the sentence was imposed in violation of 'the Constitution or laws of the United States, or that [2] the court was without jurisdiction to impose such sentence, or that [3] the sentence was in excess of the maximum authorized by law, or [JJ is otherwise subject to collateral attack, may move the court which imposed the sentence to vacate, set aside or correct the sentence....

(emphasis supplied.) Item 4 stands by itself sufficiently without our having to resort to the familiar principle that additional language is presumably separately meaningful rather than redundant. Indeed, we have previously held that the fourth prong of § 2255 encompasses other than constitutional or statutory error. See, e.g., United States v. DiRusso, 548 F.2d 372, 374-75 (1st Cir.1976) (noting that § 2255 is often a vehicle for correcting sentences based upon errors made by the sentencing judge). However, whether on constitutional or grounds otherwise subject to collateral attack, we concur with the district court’s recognition of federal habeas jurisdiction.

IV.Timing of Determination of Criminal History

18 U.S.C. § 921(a)(20), the statute hereto appertaining, provides in relevant part:

What constitutes a conviction of such a crime shall be determined in accordance with the law of the jurisdiction in which the proceedings were held. Any conviction which has, been expunged, or set aside of for which a person has been pardoned or has had civil rights restored shall not be considered a conviction for purposes of this chapter_

The government contends that the past tense phrases “has been expunged” and “has been pardoned,” indicate that only past offenses vacated prior to the federal proceeding may be discounted by the court, in effect etching the defendant’s criminal history record in stone as of that moment. We do not agree. The wording would read equally well if applied to convictions expunged, etc., subsequent to the federal sentencing.

Thus with the rule of lenity, see United States v. Boots, 80 F.3d 580, 588 (1st Cir.1996), ce rt. denied, — U.S. -, 117 S.Ct. 263, 136 L.Ed.2d 188 (1996), the government is on the short end. And with the procedural rule announced in Custis, that it is only after sentence that a defendant may attack the convictions that contributed to it, what sense would it make to say that he may attack pre-sentence convictions, but not one whose flaw did not appear until after the federal sentence? Obviously this is the situation every time it is defendant who establishes the flaw. The district court was correct. United States v. Cox, 83 F.3d 336 (10th Cir.1996). See also United States v. Bacon, 94 F.3d 158, 162 n. 3 (4th Cir.1996); Young v. Vaughn, 83 F.3d 72, 77 (3d Cir.), cert. denied, — U.S. -, 117 S.Ct. 333, 136 L.Ed.2d 245 (1996); United States v. Hofierka, 83 F.3d 357, 364 (11th Cir.), modified on other grounds on denial ofreh’g, 92 F.3d 1108 (11th Cir.1996). No circuit has indicated otherwise.

V.Basis for Vacation of State Convictions

As we have said, defendant’s motions to vacate the state convictions were based on[*202] the ground that he had not been furnished by the courts, before accepting his guilty pleas, the information necessary for his pleas to be considered - voluntary, a constitutional requirement. See Boykin v. Alabama, 395 U.S. 238, 242-43, 89 S.Ct. 1709, 1711-12, 23 L.Ed.2d 274 (1969); United States v. Houlihan, 92 F.3d 1271, 1279 (1st Cir.1996). For the Boston Municipal Court cases there were no records, presumably because more than two and a half years had elapsed since the plea and they had been destroyed pursuant to permissive Rule 211A(4). In the Dorches-ter District Court there were tapes, but they were unintelligible. One court demonstrably, and the other apparently, applied the Massachusetts rule that the burden is on the state to show the voluntariness of the plea,. Commonwealth v. Duquette, 386 Mass. 834, 841, 438 N.E.2d 334 (1982), and granted the motions to vacate.

This distresses the government, evoking the charges of windfalls and sandbagging. ^[2] It makes an elaborate argument, based on the fact that the state courts could have applied a presumption of correctness and found the plea hearings valid, see Parke v. Raley, 506 U.S. 20, 31, 113 S.Ct. 517, 524, 121 L.Ed.2d 391 (1992), and that the Massachusetts courts did not go so far as to hold the convictions unconstitutional. Putting aside the fact that the Boston Municipal Court judge specifically found a Boykin violation, we do not attach consequences to such recondite thinking. The short answer is that Congress chose to predicate sentence enhancement on state action. Surely it is not for the federal court to read the statutory language, “in accordance with the law of the jurisdiction in which the proceedings were held” as permitting us to conclude that the Massachusetts lower court decisions were wrongly decided.

The government makes a further point. Before Custis, it was permissible for a defendant to raise the invalidity of his state convictions at the time of his federal sentencing. United States v. Paleo, 967 F.2d 7, 11 (1st Cir.1992). Because the defendant did not do so, the government attempts to invoke the rule of cause and prejudice. See Coleman v. Thompson, 501 U.S. 722, 750, 111 S.Ct. 2546, 2565, 115 L.Ed.2d 640 (1991). It presses this particularly because, federal-wise, the burden would have been on the defendant to prove an inadequate plea colloquy, see United States v. Wilkinson, 926 F.2d 22, 28 (1st Cir.), cert. denied, 501 U.S. 1211, 111 S.Ct. 2813, 115 L.Ed.2d 985 (1991), overruled on other grounds by Bailey v. United States, — U.S. -, -, 116 S.Ct. 501, 509, 133 L.Ed.2d 472 (1995), and having no memory on the subject one way or the other, he would have had no proof. Our reaction is the opposite of the government’s. With no memory there was no affirmative waiver. Exceptional circumstances may excuse a delayed making of a claim, Knight v. United States, 37 F.3d 769, 773 (1st Cir.1994), and ignorance may be a factor.

Even if Curtis is not regarded as retroactive, it indicates the acceptability of this post-sentence proceeding. We are content to recognize the district court’s discretion.

Affirmed.