feat: honour the omitzero and omitempty tag options on encode

Assisted-by: GLM 5.3 Flash

decode.go

@@ -230,7 +230,7 @@ func structFields(t reflect.Type) map[string]int {
 		}
 		name := f.Name
 		if tag, ok := f.Tag.Lookup("toml"); ok {
-			tag = strings.Split(tag, ",")[0]
+			tag, _, _ = strings.Cut(tag, ",")
 			if tag == "-" {
 				continue
 			}