diff --git a/helpers/helpers.cjs b/helpers/helpers.cjs
index 81a6a854..da23784d 100644
--- a/helpers/helpers.cjs
+++ b/helpers/helpers.cjs
@@ -540,20 +540,21 @@ function expandTildePath(file, os) {
 module.exports.expandTildePath = expandTildePath;
 
 /** @typedef {import("../lib/markdownlint.mjs").LintError[]} LintErrors */
+/** @typedef {import("../lib/markdownlint.mjs").LintResults} LintResults */
 
 /**
  * Converts lint errors from resultVersion 3 to 2.
  *
- * @param {LintErrors} results Lint errors (v3).
+ * @param {LintErrors} errors Lint errors (v3).
  * @returns {LintErrors} Lint errors (v2).
  */
-function convertResultVersion3To2(results) {
+function convertResultVersion3To2(errors) {
   // Remove fixInfo and multiple errors for the same rule and line number
   const noPrevious = {
     "ruleNames": [],
     "lineNumber": -1
   };
-  return results.filter((error, index, array) => {
+  return errors.filter((error, index, array) => {
     delete error.fixInfo;
     const previous = array[index - 1] || noPrevious;
     return (
@@ -561,16 +562,16 @@ function convertResultVersion3To2(results) {
       (error.lineNumber !== previous.lineNumber)
     );
   });
-};
+}
 
 /**
  * Converts lint errors from resultVersion 2 to 1.
  *
- * @param {LintErrors} results Lint errors (v2).
+ * @param {LintErrors} errors Lint errors (v2).
  * @returns {LintErrors} Lint errors (v1).
  */
-function convertResultVersion2To1(results) {
-  for (const error of results) {
+function convertResultVersion2To1(errors) {
+  for (const error of errors) {
     // @ts-ignore
     error.ruleName = error.ruleNames[0];
     // @ts-ignore
@@ -578,18 +579,18 @@ function convertResultVersion2To1(results) {
     // @ts-ignore
     delete error.ruleNames;
   }
-  return results;
-};
+  return errors;
+}
 
 /**
  * Converts lint errors from resultVersion 2 to 0.
  *
- * @param {LintErrors} results Lint errors (v2).
+ * @param {LintErrors} errors Lint errors (v2).
  * @returns {LintErrors} Lint errors (v0).
  */
-function convertResultVersion2To0(results) {
+function convertResultVersion2To0(errors) {
   const dictionary = {};
-  for (const error of results) {
+  for (const error of errors) {
     const ruleName = error.ruleNames[0];
     const ruleLines = dictionary[ruleName] || [];
     ruleLines.push(error.lineNumber);
@@ -597,16 +598,52 @@ function convertResultVersion2To0(results) {
   }
   // @ts-ignore
   return dictionary;
-};
+}
 
+/**
+ * Copies and transforms lint results from resultVersion 3 to ?.
+ *
+ * @param {LintResults} results Lint results (v3).
+ * @param {(LintErrors)=> LintErrors} boop Lint errors (v?).
+ * @returns {LintResults} Lint results (v?).
+ */
+function copyAndTransformResults(results, boop) {
+  const newr = {};
+  Object.defineProperty(newr, "toString", { "value": results.toString });
+  for (const key of Object.keys(results)) {
+    const newrr = results[key].map((r) => ({ ...r }));
+    newr[key] = boop(newrr);
+  }
+  // @ts-ignore
+  return newr;
+}
+
+/**
+ * Converts lint results from resultVersion 3 to 0.
+ *
+ * @param {LintResults} results Lint results (v3).
+ * @returns {LintResults} Lint results (v0).
+ */
 module.exports.convertToResultVersion0 = function convertToResultVersion0(results) {
-  return convertResultVersion2To0(convertResultVersion3To2(results));
+  return copyAndTransformResults(results, (r) => convertResultVersion2To0(convertResultVersion3To2(r)));
 };
 
+/**
+ * Converts lint results from resultVersion 3 to 1.
+ *
+ * @param {LintResults} results Lint results (v3).
+ * @returns {LintResults} Lint results (v1).
+ */
 module.exports.convertToResultVersion1 = function convertToResultVersion1(results) {
-  return convertResultVersion2To1(convertResultVersion3To2(results));
+  return copyAndTransformResults(results, (r) => convertResultVersion2To1(convertResultVersion3To2(r)));
 };
 
+/**
+ * Converts lint results from resultVersion 3 to 2.
+ *
+ * @param {LintResults} results Lint results (v3).
+ * @returns {LintResults} Lint results (v2).
+ */
 module.exports.convertToResultVersion2 = function convertToResultVersion2(results) {
-  return convertResultVersion3To2(results);
+  return copyAndTransformResults(results, convertResultVersion3To2);
 };
diff --git a/lib/markdownlint.mjs b/lib/markdownlint.mjs
index 1e9b1db4..523ffd1f 100644
--- a/lib/markdownlint.mjs
+++ b/lib/markdownlint.mjs
@@ -664,14 +664,6 @@ function lintContent(
         a.ruleNames[0].localeCompare(b.ruleNames[0]) ||
         a.lineNumber - b.lineNumber
       ));
-      // Deprecated: Convert results to specified resultVersion
-      if (resultVersion === 0) {
-        results = helpers.convertToResultVersion0(results);
-      } else if (resultVersion === 1) {
-        results = helpers.convertToResultVersion1(results);
-      } else if (resultVersion === 2) {
-        results = helpers.convertToResultVersion2(results);
-      }
       return results;
     };
     // Run all rules
@@ -893,7 +885,16 @@ function lintInput(options, synchronous, callback) {
     } else if (concurrency === 0) {
       // Finish
       done = true;
-      return callback(null, results);
+      // Deprecated: Convert results to specified resultVersion
+      let convertedResults = results;
+      if (resultVersion === 0) {
+        convertedResults = helpers.convertToResultVersion0(results);
+      } else if (resultVersion === 1) {
+        convertedResults = helpers.convertToResultVersion1(results);
+      } else if (resultVersion === 2) {
+        convertedResults = helpers.convertToResultVersion2(results);
+      }
+      return callback(null, convertedResults);
     }
     return null;
   }
diff --git a/test/markdownlint-test-result-object.mjs b/test/markdownlint-test-result-object.mjs
index 5b89aa65..d543a3fb 100644
--- a/test/markdownlint-test-result-object.mjs
+++ b/test/markdownlint-test-result-object.mjs
@@ -2,7 +2,9 @@
 
 import test from "ava";
 import { lint as lintAsync } from "markdownlint/async";
+import { lint as lintPromise } from "markdownlint/promise";
 import { lint as lintSync } from "markdownlint/sync";
+import { convertToResultVersion0, convertToResultVersion1, convertToResultVersion2 } from "markdownlint/helpers";
 import { importWithTypeJson } from "./esm-helpers.mjs";
 const packageJson = await importWithTypeJson(import.meta, "../package.json");
 const { homepage, version } = packageJson;
@@ -623,3 +625,35 @@ test("frontMatterResultVersion3", (t) => new Promise((resolve) => {
     resolve();
   });
 }));
+
+test("convertToResultVersionN", async (t) => {
+  t.plan(6);
+  const options = {
+    "files": [
+      "./test/break-all-the-rules.md",
+      "./test/inline-disable-enable.md"
+    ],
+    "strings": {
+      "apple": "#  Heading",
+      "banana": "## Heading"
+    }
+  };
+  const [ version3, version2, version1, version0 ] = await Promise.all([
+    lintPromise(options),
+    lintPromise({ ...options, "resultVersion": 2 }),
+    lintPromise({ ...options, "resultVersion": 1 }),
+    lintPromise({ ...options, "resultVersion": 0 })
+  ]);
+
+  const v2 = convertToResultVersion2(version3);
+  t.deepEqual(v2, version2);
+  t.is(v2.toString(), version2.toString());
+
+  const v1 = convertToResultVersion1(version3);
+  t.deepEqual(v1, version1);
+  t.is(v1.toString(), version1.toString());
+
+  const v0 = convertToResultVersion0(version3);
+  t.deepEqual(v0, version0);
+  t.is(v0.toString(), version0.toString());
+});