diff --git a/.palantir/go-version b/.palantir/go-version
index beddcb5d..83534e24 100644
--- a/.palantir/go-version
+++ b/.palantir/go-version
@@ -1 +1 @@
-go1.19.4
\ No newline at end of file
+go1.20
\ No newline at end of file
diff --git a/generated_src/internal/amalgomated_flag/example_test.go b/generated_src/internal/amalgomated_flag/example_test.go
index 04a0d20e..088447d4 100644
--- a/generated_src/internal/amalgomated_flag/example_test.go
+++ b/generated_src/internal/amalgomated_flag/example_test.go
@@ -78,6 +78,8 @@ func Example() {
 	// to enable the flag package to see the flags defined there, one must
 	// execute, typically at the start of main (not init!):
 	//	flag.Parse()
-	// We don't run it here because this is not a main function and
-	// the testing suite has already parsed the flags.
+	// We don't call it here because this code is a function called "Example"
+	// that is part of the testing suite for the package, which has already
+	// parsed the flags. When viewed at pkg.go.dev, however, the function is
+	// renamed to "main" and it could be run as a standalone example.
 }
diff --git a/generated_src/internal/amalgomated_flag/flag.go b/generated_src/internal/amalgomated_flag/flag.go
index 9abf8d76..ef3cf29c 100644
--- a/generated_src/internal/amalgomated_flag/flag.go
+++ b/generated_src/internal/amalgomated_flag/flag.go
@@ -550,9 +550,11 @@ func UnquoteUsage(flag *Flag) (name string, usage string) {
 	}
 	// No explicit name, so use type if we can find one.
 	name = "value"
-	switch flag.Value.(type) {
+	switch fv := flag.Value.(type) {
 	case boolFlag:
-		name = ""
+		if fv.IsBoolFlag() {
+			name = ""
+		}
 	case *durationValue:
 		name = "duration"
 	case *float64Value:
@@ -1054,9 +1056,9 @@ func (f *FlagSet) parseOne() (bool, error) {
 			break
 		}
 	}
-	m := f.formal
-	flag, alreadythere := m[name] // BUG
-	if !alreadythere {
+
+	flag, ok := f.formal[name]
+	if !ok {
 		if name == "help" || name == "h" { // special case for nice help message.
 			f.usage()
 			return false, ErrHelp
diff --git a/generated_src/internal/amalgomated_flag/flag_test.go b/generated_src/internal/amalgomated_flag/flag_test.go
index ca6ba5d1..17551684 100644
--- a/generated_src/internal/amalgomated_flag/flag_test.go
+++ b/generated_src/internal/amalgomated_flag/flag_test.go
@@ -356,10 +356,35 @@ func TestUserDefinedBool(t *testing.T) {
 	}
 }
 
-func TestSetOutput(t *testing.T) {
+func TestUserDefinedBoolUsage(t *testing.T) {
 	var flags FlagSet
+	flags.Init("test", ContinueOnError)
 	var buf bytes.Buffer
 	flags.SetOutput(&buf)
+	var b boolFlagVar
+	flags.Var(&b, "b", "X")
+	b.count = 0
+	// b.IsBoolFlag() will return true and usage will look boolean.
+	flags.PrintDefaults()
+	got := buf.String()
+	want := "  -b\tX\n"
+	if got != want {
+		t.Errorf("false: want %q; got %q", want, got)
+	}
+	b.count = 4
+	// b.IsBoolFlag() will return false and usage will look non-boolean.
+	flags.PrintDefaults()
+	got = buf.String()
+	want = "  -b\tX\n  -b value\n    \tX\n"
+	if got != want {
+		t.Errorf("false: want %q; got %q", want, got)
+	}
+}
+
+func TestSetOutput(t *testing.T) {
+	var flags FlagSet
+	var buf strings.Builder
+	flags.SetOutput(&buf)
 	flags.Init("test", ContinueOnError)
 	flags.Parse([]string{"-unknown"})
 	if out := buf.String(); !strings.Contains(out, "-unknown") {
@@ -488,7 +513,7 @@ panic calling String method on zero flag_test.zeroPanicker for flag ZP1: panic!
 
 func TestPrintDefaults(t *testing.T) {
 	fs := NewFlagSet("print defaults test", ContinueOnError)
-	var buf bytes.Buffer
+	var buf strings.Builder
 	fs.SetOutput(&buf)
 	fs.Bool("A", false, "for bootstrapping, allow 'any' type")
 	fs.Bool("Alongflagname", false, "disable bounds checking")
@@ -531,7 +556,7 @@ func TestIntFlagOverflow(t *testing.T) {
 // Issue 20998: Usage should respect CommandLine.output.
 func TestUsageOutput(t *testing.T) {
 	ResetForTesting(DefaultUsage)
-	var buf bytes.Buffer
+	var buf strings.Builder
 	CommandLine.SetOutput(&buf)
 	defer func(old []string) { os.Args = old }(os.Args)
 	os.Args = []string{"app", "-i=1", "-unknown"}
@@ -726,7 +751,7 @@ func TestInvalidFlags(t *testing.T) {
 		testName := fmt.Sprintf("FlagSet.Var(&v, %q, \"\")", test.flag)
 
 		fs := NewFlagSet("", ContinueOnError)
-		buf := bytes.NewBuffer(nil)
+		buf := &strings.Builder{}
 		fs.SetOutput(buf)
 
 		mustPanic(t, testName, test.errorMsg, func() {
@@ -758,7 +783,7 @@ func TestRedefinedFlags(t *testing.T) {
 		testName := fmt.Sprintf("flag redefined in FlagSet(%q)", test.flagSetName)
 
 		fs := NewFlagSet(test.flagSetName, ContinueOnError)
-		buf := bytes.NewBuffer(nil)
+		buf := &strings.Builder{}
 		fs.SetOutput(buf)
 
 		var v flagVar
diff --git a/go.mod b/go.mod
index d00a2f8c..d76abf81 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/palantir/godel-okgo-asset-ineffassign
 
-go 1.19
+go 1.20
 
 require (
 	github.com/gordonklaus/ineffassign v0.0.0-20210914165742-4cc7213b9bc8