Use MustWriteByte() where possible.

array.go

@@ -21,7 +21,7 @@ func (vis *visitor) visitArray(w io.Writer, v Value) {
 
 	iago.MustWriteString(w, "{\n")
 	vis.visitArrayValues(indent.NewIndenter(w, vis.indent), v)
-	iago.MustWriteString(w, "}")
+	iago.MustWriteByte(w, '}')
 }
 
 func (vis *visitor) visitArrayValues(w io.Writer, v Value) {

filter.go

@@ -57,7 +57,7 @@ func ReflectTypeFilter(w io.Writer, v Value) (n int, err error) {
 
 		if s := t.PkgPath(); s != "" {
 			n += iago.MustWriteString(w, s)
-			n += iago.MustWriteString(w, ".")
+			n += iago.MustWriteByte(w, '.')
 		}
 
 		if s := t.Name(); s != "" {
@@ -70,11 +70,11 @@ func ReflectTypeFilter(w io.Writer, v Value) (n int, err error) {
 	// always render the pointer value for the type, this way when the field is
 	// unexported we still get something we can compare to known types instead of a
 	// rendering of the reflect.rtype struct.
-	n += iago.MustWriteString(w, " ")
+	n += iago.MustWriteByte(w, ' ')
 	n += iago.MustWriteString(w, formatPointerHex(v.Value.Pointer(), false))
 
 	if ambiguous {
-		n += iago.MustWriteString(w, ")")
+		n += iago.MustWriteByte(w, ')')
 	}
 
 	return

map.go

@@ -30,7 +30,7 @@ func (vis *visitor) visitMap(w io.Writer, v Value) {
 
 	iago.MustWriteString(w, "{\n")
 	vis.visitMapElements(indent.NewIndenter(w, vis.indent), v)
-	iago.MustWriteString(w, "}")
+	iago.MustWriteByte(w, '}')
 }
 
 func (vis *visitor) visitMapElements(w io.Writer, v Value) {

ptr.go

@@ -14,7 +14,7 @@ func (vis *visitor) visitPtr(w io.Writer, v Value) {
 	defer vis.leave(v)
 
 	if v.IsAmbiguousType() {
-		iago.MustWriteString(w, "*")
+		iago.MustWriteByte(w, '*')
 	}
 
 	elem := v.Value.Elem()

shallow.go

@@ -81,7 +81,7 @@ func (vis *visitor) visitUnsafePointer(w io.Writer, v Value) {
 func (vis *visitor) visitChan(w io.Writer, v Value) {
 	if v.IsAmbiguousType() {
 		iago.MustWriteString(w, v.TypeName())
-		iago.MustWriteString(w, "(")
+		iago.MustWriteByte(w, '(')
 	}
 
 	iago.MustWriteString(
@@ -99,7 +99,7 @@ func (vis *visitor) visitChan(w io.Writer, v Value) {
 	}
 
 	if v.IsAmbiguousType() {
-		iago.MustWriteString(w, ")")
+		iago.MustWriteByte(w, ')')
 	}
 }
 

struct.go

@@ -25,7 +25,7 @@ func (vis *visitor) visitStruct(w io.Writer, v Value) {
 
 	iago.MustWriteString(w, "{\n")
 	vis.visitStructFields(indent.NewIndenter(w, vis.indent), v)
-	iago.MustWriteString(w, "}")
+	iago.MustWriteByte(w, '}')
 }
 
 func (vis *visitor) visitStructFields(w io.Writer, v Value) {

visitor.go

@@ -102,9 +102,9 @@ func (vis *visitor) enter(w io.Writer, v Value) bool {
 
 	if v.IsAmbiguousType() {
 		iago.MustWriteString(w, v.TypeName())
-		iago.MustWriteString(w, "(")
+		iago.MustWriteByte(w, '(')
 		iago.MustWriteString(w, marker)
-		iago.MustWriteString(w, ")")
+		iago.MustWriteByte(w, ')')
 	} else {
 		iago.MustWriteString(w, marker)
 	}