diff --git a/lib/lib.es2020.intl.d.ts b/lib/lib.es2020.intl.d.ts
index 25c6aa1b8f272..1ec4628bb94dd 100644
--- a/lib/lib.es2020.intl.d.ts
+++ b/lib/lib.es2020.intl.d.ts
@@ -74,239 +74,6 @@ declare namespace Intl {
      */
     type RelativeTimeFormatStyle = "long" | "short" | "narrow";
 
-    /**
-     * Unicode Calendar Identifier
-     *
-     * [Reference](http://unicode.org/reports/tr35/#UnicodeCalendarIdentifier)
-     *
-     * [Source](https://github.com/unicode-org/cldr/blob/b805d0b/common/bcp47/calendar.xml)
-     */
-    type Calendar =
-        // Thai Buddhist calendar
-        | "buddhist"
-        // Traditional Chinese calendar
-        | "chinese"
-        // Coptic calendar
-        | "coptic"
-        // Traditional Korean calendar
-        | "dangi"
-        // Ethiopic calendar, Amete Alem (epoch approx. 5493 B.C.E)
-        | "ethiopic-amete-alem" | "ethioaa"
-        // Ethiopic calendar, Amete Mihret (epoch approx, 8 C.E.)
-        | "ethiopic"
-        // Gregorian calendar
-        | "gregorian"
-        // Gregorian calendar (alias)
-        | "gregory"
-        // Traditional Hebrew calendar
-        | "hebrew"
-        // Indian calendar
-        | "indian"
-        // Islamic calendar
-        | "islamic"
-        // Islamic calendar, Umm al-Qura
-        | "islamic-umalqura"
-        // Islamic calendar, tabular (intercalary years [2,5,7,10,13,16,18,21,24,26,29] - astronomical epoch)
-        | "islamic-tbla"
-        // Islamic calendar, tabular (intercalary years [2,5,7,10,13,16,18,21,24,26,29] - civil epoch)
-        | "islamic-civil"
-        | "islamicc"  // Deprecated alias
-        // Islamic calendar, Saudi Arabia sighting
-        | "islamic-rgsa"
-        // ISO calendar (Gregorian calendar using the ISO 8601 calendar week rules)
-        | "iso8601"
-        // Japanese Imperial calendar
-        | "japanese"
-        // Persian calendar
-        | "persian"
-        // Republic of China calendar
-        | "roc"
-        ;
-
-    /**
-     * Unicode Number System Identifier
-     *
-     * [Reference](http://unicode.org/reports/tr35/#UnicodeNumberSystemIdentifier)
-     *
-     * [Source](https://github.com/unicode-org/cldr/blob/be7a953/common/bcp47/number.xml)
-     */
-    type NumberingSystem =
-        // Adlam digits
-        | "adlm"
-        // Ahom digits
-        | "ahom"
-        // Arabic-Indic digits
-        | "arab"
-        // Extended Arabic-Indic digits
-        | "arabext"
-        // Armenian upper case numerals — algorithmic
-        | "armn"
-        // Armenian lower case numerals — algorithmic
-        | "armnlow"
-        // Balinese digits
-        | "bali"
-        // Bengali digits
-        | "beng"
-        // Bhaiksuki digits
-        | "bhks"
-        // Brahmi digits
-        | "brah"
-        // Chakma digits
-        | "cakm"
-        // Cham digits
-        | "cham"
-        // Cyrillic numerals — algorithmic
-        | "cyrl"
-        // Devanagari digits
-        | "deva"
-        // Dives Akuru digits
-        | "diak"
-        // Ethiopic numerals — algorithmic
-        | "ethi"
-        // Financial numerals — may be algorithmic
-        | "finance"
-        // Full width digits
-        | "fullwide"
-        // Georgian numerals — algorithmic
-        | "geor"
-        // Gunjala Gondi digits
-        | "gong"
-        // Masaram Gondi digits
-        | "gonm"
-        // Greek upper case numerals — algorithmic
-        | "grek"
-        // Greek lower case numerals — algorithmic
-        | "greklow"
-        // Gujarati digits
-        | "gujr"
-        // Gurmukhi digits
-        | "guru"
-        // Han-character day-of-month numbering for lunar/other traditional calendars"
-        | "hanidays"
-        // Positional decimal system using Chinese number ideographs as digits
-        | "hanidec"
-        // Simplified Chinese numerals — algorithmic
-        | "hans"
-        // Simplified Chinese financial numerals — algorithmic
-        | "hansfin"
-        // Traditional Chinese numerals — algorithmic
-        | "hant"
-        // Traditional Chinese financial numerals — algorithmic
-        | "hantfin"
-        // Hebrew numerals — algorithmic
-        | "hebr"
-        // Pahawh Hmong digits
-        | "hmng"
-        // Nyiakeng Puachue Hmong digits
-        | "hmnp"
-        // Javanese digits
-        | "java"
-        // Japanese numerals — algorithmic
-        | "jpan"
-        // Japanese financial numerals — algorithmic
-        | "jpanfin"
-        // Japanese first-year Gannen numbering for Japanese calendar
-        | "jpanyear"
-        // Kayah Li digits
-        | "kali"
-        // Khmer digits
-        | "khmr"
-        // Kannada digits
-        | "knda"
-        // Tai Tham Hora (secular) digits
-        | "lana"
-        // Tai Tham Tham (ecclesiastical) digits
-        | "lanatham"
-        // Lao digits
-        | "laoo"
-        // Latin digits
-        | "latn"
-        // Lepcha digits
-        | "lepc"
-        // Limbu digits
-        | "limb"
-        // Mathematical bold digits
-        | "mathbold"
-        // Mathematical double-struck digits
-        | "mathdbl"
-        // Mathematical monospace digits
-        | "mathmono"
-        // Mathematical sans-serif bold digits
-        | "mathsanb"
-        // Mathematical sans-serif digits
-        | "mathsans"
-        // Malayalam digits
-        | "mlym"
-        // Modi digits
-        | "modi"
-        // Mongolian digits
-        | "mong"
-        // Mro digits
-        | "mroo"
-        // Meetei Mayek digits
-        | "mtei"
-        // Myanmar digits
-        | "mymr"
-        // Myanmar Shan digits
-        | "mymrshan"
-        // Myanmar Tai Laing digits
-        | "mymrtlng"
-        // Native digits
-        | "native"
-        // Newa digits
-        | "newa"
-        // N'Ko digits
-        | "nkoo"
-        // Ol Chiki digits
-        | "olck"
-        // Oriya digits
-        | "orya"
-        // Osmanya digits
-        | "osma"
-        // Hanifi Rohingya digits
-        | "rohg"
-        // Roman upper case numerals — algorithmic
-        | "roman"
-        // Roman lowercase numerals — algorithmic
-        | "romanlow"
-        // Saurashtra digits
-        | "saur"
-        // Sharada digits
-        | "shrd"
-        // Khudawadi digits
-        | "sind"
-        // Sinhala Lith digits
-        | "sinh"
-        // Sora_Sompeng digits
-        | "sora"
-        // Sundanese digits
-        | "sund"
-        // Takri digits
-        | "takr"
-        // New Tai Lue digits
-        | "talu"
-        // Tamil numerals — algorithmic
-        | "taml"
-        // Modern Tamil decimal digits
-        | "tamldec"
-        // Telugu digits
-        | "telu"
-        // Thai digits
-        | "thai"
-        // Tirhuta digits
-        | "tirh"
-        // Tibetan digits
-        | "tibt"
-        // Traditional numerals — may be algorithmic
-        | "traditional" | "traditio"
-        // Vai digits
-        | "vaii"
-        // Warang Citi digits
-        | "wara"
-        // Wancho digits
-        | "wcho"
-        ;
-
     /**
      * An object with some or all of properties of `options` parameter
      * of `Intl.RelativeTimeFormat` constructor.
@@ -534,9 +301,9 @@ declare namespace Intl {
     interface DateTimeFormatOptions {
         dateStyle?: "full" | "long" | "medium" | "short";
         timeStyle?: "full" | "long" | "medium" | "short";
-        calendar?: Calendar;
+        calendar?: string;
         dayPeriod?: "narrow" | "short" | "long";
-        numberingSystem?: NumberingSystem;
+        numberingSystem?: string;
         hourCycle?: "h11" | "h12" | "h23" | "h24";
         fractionalSecondDigits?: 0 | 1 | 2 | 3;
     }
diff --git a/lib/tsc.js b/lib/tsc.js
index f40025ec38f85..b036dfa0fb34f 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -46050,7 +46050,7 @@ var ts;
             }
             return true;
         }
-        function removeRedundantLiteralTypes(types, includes) {
+        function removeRedundantLiteralTypes(types, includes, reduceVoidUndefined) {
             var i = types.length;
             while (i > 0) {
                 i--;
@@ -46060,7 +46060,7 @@ var ts;
                     flags & 256 && includes & 8 ||
                     flags & 2048 && includes & 64 ||
                     flags & 8192 && includes & 4096 ||
-                    flags & 32768 && includes & 16384 ||
+                    reduceVoidUndefined && flags & 32768 && includes & 16384 ||
                     isFreshLiteralType(t) && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
@@ -46121,7 +46121,7 @@ var ts;
                 }
                 if (unionReduction & (1 | 2)) {
                     if (includes & (2944 | 8192) || includes & 16384 && includes & 32768) {
-                        removeRedundantLiteralTypes(typeSet, includes);
+                        removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & 2));
                     }
                     if (includes & 128 && includes & 134217728) {
                         removeStringLiteralsMatchedByTemplateLiterals(typeSet);
@@ -53172,7 +53172,16 @@ var ts;
                         var type = getTypeOfDottedName(node.expression, diagnostic);
                         if (type) {
                             var name = node.name;
-                            var prop = getPropertyOfType(type, ts.isPrivateIdentifier(name) ? ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText) : name.escapedText);
+                            var prop = void 0;
+                            if (ts.isPrivateIdentifier(name)) {
+                                if (!type.symbol) {
+                                    return undefined;
+                                }
+                                prop = getPropertyOfType(type, ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText));
+                            }
+                            else {
+                                prop = getPropertyOfType(type, name.escapedText);
+                            }
                             return prop && getExplicitTypeOfSymbol(prop, diagnostic);
                         }
                         return undefined;
@@ -62908,7 +62917,9 @@ var ts;
                 : ts.isPropertyAccessExpression(location) ? location.name
                     : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                         : undefined;
-            if (!testedNode) {
+            var isPropertyExpressionCast = ts.isPropertyAccessExpression(location)
+                && ts.isAssertionExpression(ts.skipParentheses(location.expression));
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }
             var possiblyFalsy = getFalsyFlags(type);
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 78378cc6eb926..eecb6de986cea 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -55677,7 +55677,7 @@ var ts;
             }
             return true;
         }
-        function removeRedundantLiteralTypes(types, includes) {
+        function removeRedundantLiteralTypes(types, includes, reduceVoidUndefined) {
             var i = types.length;
             while (i > 0) {
                 i--;
@@ -55687,7 +55687,7 @@ var ts;
                     flags & 256 /* NumberLiteral */ && includes & 8 /* Number */ ||
                     flags & 2048 /* BigIntLiteral */ && includes & 64 /* BigInt */ ||
                     flags & 8192 /* UniqueESSymbol */ && includes & 4096 /* ESSymbol */ ||
-                    flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
+                    reduceVoidUndefined && flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
                     isFreshLiteralType(t) && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
@@ -55755,7 +55755,7 @@ var ts;
                 }
                 if (unionReduction & (1 /* Literal */ | 2 /* Subtype */)) {
                     if (includes & (2944 /* Literal */ | 8192 /* UniqueESSymbol */) || includes & 16384 /* Void */ && includes & 32768 /* Undefined */) {
-                        removeRedundantLiteralTypes(typeSet, includes);
+                        removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & 2 /* Subtype */));
                     }
                     if (includes & 128 /* StringLiteral */ && includes & 134217728 /* TemplateLiteral */) {
                         removeStringLiteralsMatchedByTemplateLiterals(typeSet);
@@ -63776,7 +63776,16 @@ var ts;
                         var type = getTypeOfDottedName(node.expression, diagnostic);
                         if (type) {
                             var name = node.name;
-                            var prop = getPropertyOfType(type, ts.isPrivateIdentifier(name) ? ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText) : name.escapedText);
+                            var prop = void 0;
+                            if (ts.isPrivateIdentifier(name)) {
+                                if (!type.symbol) {
+                                    return undefined;
+                                }
+                                prop = getPropertyOfType(type, ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText));
+                            }
+                            else {
+                                prop = getPropertyOfType(type, name.escapedText);
+                            }
                             return prop && getExplicitTypeOfSymbol(prop, diagnostic);
                         }
                         return undefined;
@@ -75193,7 +75202,9 @@ var ts;
                 : ts.isPropertyAccessExpression(location) ? location.name
                     : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                         : undefined;
-            if (!testedNode) {
+            var isPropertyExpressionCast = ts.isPropertyAccessExpression(location)
+                && ts.isAssertionExpression(ts.skipParentheses(location.expression));
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }
             var possiblyFalsy = getFalsyFlags(type);
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index ee3a343724bd9..2f427b2a31f99 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -55871,7 +55871,7 @@ var ts;
             }
             return true;
         }
-        function removeRedundantLiteralTypes(types, includes) {
+        function removeRedundantLiteralTypes(types, includes, reduceVoidUndefined) {
             var i = types.length;
             while (i > 0) {
                 i--;
@@ -55881,7 +55881,7 @@ var ts;
                     flags & 256 /* NumberLiteral */ && includes & 8 /* Number */ ||
                     flags & 2048 /* BigIntLiteral */ && includes & 64 /* BigInt */ ||
                     flags & 8192 /* UniqueESSymbol */ && includes & 4096 /* ESSymbol */ ||
-                    flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
+                    reduceVoidUndefined && flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
                     isFreshLiteralType(t) && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
@@ -55949,7 +55949,7 @@ var ts;
                 }
                 if (unionReduction & (1 /* Literal */ | 2 /* Subtype */)) {
                     if (includes & (2944 /* Literal */ | 8192 /* UniqueESSymbol */) || includes & 16384 /* Void */ && includes & 32768 /* Undefined */) {
-                        removeRedundantLiteralTypes(typeSet, includes);
+                        removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & 2 /* Subtype */));
                     }
                     if (includes & 128 /* StringLiteral */ && includes & 134217728 /* TemplateLiteral */) {
                         removeStringLiteralsMatchedByTemplateLiterals(typeSet);
@@ -63970,7 +63970,16 @@ var ts;
                         var type = getTypeOfDottedName(node.expression, diagnostic);
                         if (type) {
                             var name = node.name;
-                            var prop = getPropertyOfType(type, ts.isPrivateIdentifier(name) ? ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText) : name.escapedText);
+                            var prop = void 0;
+                            if (ts.isPrivateIdentifier(name)) {
+                                if (!type.symbol) {
+                                    return undefined;
+                                }
+                                prop = getPropertyOfType(type, ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText));
+                            }
+                            else {
+                                prop = getPropertyOfType(type, name.escapedText);
+                            }
                             return prop && getExplicitTypeOfSymbol(prop, diagnostic);
                         }
                         return undefined;
@@ -75387,7 +75396,9 @@ var ts;
                 : ts.isPropertyAccessExpression(location) ? location.name
                     : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                         : undefined;
-            if (!testedNode) {
+            var isPropertyExpressionCast = ts.isPropertyAccessExpression(location)
+                && ts.isAssertionExpression(ts.skipParentheses(location.expression));
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }
             var possiblyFalsy = getFalsyFlags(type);
diff --git a/lib/typescript.js b/lib/typescript.js
index 4ccac1a141ac4..fde2172def3b7 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -55871,7 +55871,7 @@ var ts;
             }
             return true;
         }
-        function removeRedundantLiteralTypes(types, includes) {
+        function removeRedundantLiteralTypes(types, includes, reduceVoidUndefined) {
             var i = types.length;
             while (i > 0) {
                 i--;
@@ -55881,7 +55881,7 @@ var ts;
                     flags & 256 /* NumberLiteral */ && includes & 8 /* Number */ ||
                     flags & 2048 /* BigIntLiteral */ && includes & 64 /* BigInt */ ||
                     flags & 8192 /* UniqueESSymbol */ && includes & 4096 /* ESSymbol */ ||
-                    flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
+                    reduceVoidUndefined && flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
                     isFreshLiteralType(t) && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
@@ -55949,7 +55949,7 @@ var ts;
                 }
                 if (unionReduction & (1 /* Literal */ | 2 /* Subtype */)) {
                     if (includes & (2944 /* Literal */ | 8192 /* UniqueESSymbol */) || includes & 16384 /* Void */ && includes & 32768 /* Undefined */) {
-                        removeRedundantLiteralTypes(typeSet, includes);
+                        removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & 2 /* Subtype */));
                     }
                     if (includes & 128 /* StringLiteral */ && includes & 134217728 /* TemplateLiteral */) {
                         removeStringLiteralsMatchedByTemplateLiterals(typeSet);
@@ -63970,7 +63970,16 @@ var ts;
                         var type = getTypeOfDottedName(node.expression, diagnostic);
                         if (type) {
                             var name = node.name;
-                            var prop = getPropertyOfType(type, ts.isPrivateIdentifier(name) ? ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText) : name.escapedText);
+                            var prop = void 0;
+                            if (ts.isPrivateIdentifier(name)) {
+                                if (!type.symbol) {
+                                    return undefined;
+                                }
+                                prop = getPropertyOfType(type, ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText));
+                            }
+                            else {
+                                prop = getPropertyOfType(type, name.escapedText);
+                            }
                             return prop && getExplicitTypeOfSymbol(prop, diagnostic);
                         }
                         return undefined;
@@ -75387,7 +75396,9 @@ var ts;
                 : ts.isPropertyAccessExpression(location) ? location.name
                     : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                         : undefined;
-            if (!testedNode) {
+            var isPropertyExpressionCast = ts.isPropertyAccessExpression(location)
+                && ts.isAssertionExpression(ts.skipParentheses(location.expression));
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }
             var possiblyFalsy = getFalsyFlags(type);
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 9d3d0a2f68f64..77c96789eb5f9 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -55871,7 +55871,7 @@ var ts;
             }
             return true;
         }
-        function removeRedundantLiteralTypes(types, includes) {
+        function removeRedundantLiteralTypes(types, includes, reduceVoidUndefined) {
             var i = types.length;
             while (i > 0) {
                 i--;
@@ -55881,7 +55881,7 @@ var ts;
                     flags & 256 /* NumberLiteral */ && includes & 8 /* Number */ ||
                     flags & 2048 /* BigIntLiteral */ && includes & 64 /* BigInt */ ||
                     flags & 8192 /* UniqueESSymbol */ && includes & 4096 /* ESSymbol */ ||
-                    flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
+                    reduceVoidUndefined && flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
                     isFreshLiteralType(t) && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
@@ -55949,7 +55949,7 @@ var ts;
                 }
                 if (unionReduction & (1 /* Literal */ | 2 /* Subtype */)) {
                     if (includes & (2944 /* Literal */ | 8192 /* UniqueESSymbol */) || includes & 16384 /* Void */ && includes & 32768 /* Undefined */) {
-                        removeRedundantLiteralTypes(typeSet, includes);
+                        removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & 2 /* Subtype */));
                     }
                     if (includes & 128 /* StringLiteral */ && includes & 134217728 /* TemplateLiteral */) {
                         removeStringLiteralsMatchedByTemplateLiterals(typeSet);
@@ -63970,7 +63970,16 @@ var ts;
                         var type = getTypeOfDottedName(node.expression, diagnostic);
                         if (type) {
                             var name = node.name;
-                            var prop = getPropertyOfType(type, ts.isPrivateIdentifier(name) ? ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText) : name.escapedText);
+                            var prop = void 0;
+                            if (ts.isPrivateIdentifier(name)) {
+                                if (!type.symbol) {
+                                    return undefined;
+                                }
+                                prop = getPropertyOfType(type, ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText));
+                            }
+                            else {
+                                prop = getPropertyOfType(type, name.escapedText);
+                            }
                             return prop && getExplicitTypeOfSymbol(prop, diagnostic);
                         }
                         return undefined;
@@ -75387,7 +75396,9 @@ var ts;
                 : ts.isPropertyAccessExpression(location) ? location.name
                     : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                         : undefined;
-            if (!testedNode) {
+            var isPropertyExpressionCast = ts.isPropertyAccessExpression(location)
+                && ts.isAssertionExpression(ts.skipParentheses(location.expression));
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }
             var possiblyFalsy = getFalsyFlags(type);
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index f33fba5875463..dac9612324cfb 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -55666,7 +55666,7 @@ var ts;
             }
             return true;
         }
-        function removeRedundantLiteralTypes(types, includes) {
+        function removeRedundantLiteralTypes(types, includes, reduceVoidUndefined) {
             var i = types.length;
             while (i > 0) {
                 i--;
@@ -55676,7 +55676,7 @@ var ts;
                     flags & 256 /* NumberLiteral */ && includes & 8 /* Number */ ||
                     flags & 2048 /* BigIntLiteral */ && includes & 64 /* BigInt */ ||
                     flags & 8192 /* UniqueESSymbol */ && includes & 4096 /* ESSymbol */ ||
-                    flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
+                    reduceVoidUndefined && flags & 32768 /* Undefined */ && includes & 16384 /* Void */ ||
                     isFreshLiteralType(t) && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
@@ -55744,7 +55744,7 @@ var ts;
                 }
                 if (unionReduction & (1 /* Literal */ | 2 /* Subtype */)) {
                     if (includes & (2944 /* Literal */ | 8192 /* UniqueESSymbol */) || includes & 16384 /* Void */ && includes & 32768 /* Undefined */) {
-                        removeRedundantLiteralTypes(typeSet, includes);
+                        removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & 2 /* Subtype */));
                     }
                     if (includes & 128 /* StringLiteral */ && includes & 134217728 /* TemplateLiteral */) {
                         removeStringLiteralsMatchedByTemplateLiterals(typeSet);
@@ -63765,7 +63765,16 @@ var ts;
                         var type = getTypeOfDottedName(node.expression, diagnostic);
                         if (type) {
                             var name = node.name;
-                            var prop = getPropertyOfType(type, ts.isPrivateIdentifier(name) ? ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText) : name.escapedText);
+                            var prop = void 0;
+                            if (ts.isPrivateIdentifier(name)) {
+                                if (!type.symbol) {
+                                    return undefined;
+                                }
+                                prop = getPropertyOfType(type, ts.getSymbolNameForPrivateIdentifier(type.symbol, name.escapedText));
+                            }
+                            else {
+                                prop = getPropertyOfType(type, name.escapedText);
+                            }
                             return prop && getExplicitTypeOfSymbol(prop, diagnostic);
                         }
                         return undefined;
@@ -75182,7 +75191,9 @@ var ts;
                 : ts.isPropertyAccessExpression(location) ? location.name
                     : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                         : undefined;
-            if (!testedNode) {
+            var isPropertyExpressionCast = ts.isPropertyAccessExpression(location)
+                && ts.isAssertionExpression(ts.skipParentheses(location.expression));
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }
             var possiblyFalsy = getFalsyFlags(type);
diff --git a/package.json b/package.json
index 7588a51cfc211..a31d5c9b770a2 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "https://www.typescriptlang.org/",
-    "version": "4.2.1-rc",
+    "version": "4.2.2",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [