diff --git a/sizeFunc.go b/sizeFunc.go
index cd76fd5..d56b101 100644
--- a/sizeFunc.go
+++ b/sizeFunc.go
@@ -11,6 +11,10 @@ import (
 // "min", "max", "clamp", "sum", "sub", "mul", and "div" functions are available.
 type SizeFunc interface {
 	fmt.Stringer
+	// Name() returns the function name: "min", "max", "clamp", "sum", "sub", "mul", or "div"
+	Name() string
+	// Args() returns a list of function arguments
+	Args() []any
 	cssString(session Session) string
 	writeCSS(topFunc string, buffer *strings.Builder, session Session)
 	writeString(topFunc string, buffer *strings.Builder)
@@ -159,6 +163,16 @@ func (data *sizeFuncData) String() string {
 	return buffer.String()
 }
 
+func (data *sizeFuncData) Name() string {
+	return data.tag
+}
+
+func (data *sizeFuncData) Args() []any {
+	args := make([]any, len(data.args))
+	copy(args, data.args)
+	return args
+}
+
 func (data *sizeFuncData) writeString(topFunc string, buffer *strings.Builder) {
 	buffer.WriteString(data.tag)
 	buffer.WriteRune('(')
diff --git a/viewStyle.go b/viewStyle.go
index 4adecdc..1abd273 100644
--- a/viewStyle.go
+++ b/viewStyle.go
@@ -582,7 +582,8 @@ func writePropertyValue(buffer *strings.Builder, tag string, value any, indent s
 			} else {
 				for _, ch := range text {
 					if (ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') ||
-						ch == '+' || ch == '-' || ch == '@' || ch == '/' || ch == '_' || ch == ':' {
+						ch == '+' || ch == '-' || ch == '@' || ch == '/' || ch == '_' || ch == ':' ||
+						ch == '#' || ch == '%' || ch == 'π' || ch == '°' {
 					} else {
 						simple = false
 						break
@@ -667,7 +668,7 @@ func writePropertyValue(buffer *strings.Builder, tag string, value any, indent s
 		value.writeString(buffer, indent+"\t")
 
 	case fmt.Stringer:
-		buffer.WriteString(value.String())
+		writeString(value.String())
 
 	case []ViewShadow:
 		switch len(value) {