refactor: minor changes and fixes

internal/kwargs/kwargs.go

@@ -5,15 +5,28 @@ import (
 	"fmt"
 
 	"git.towk2.me/towk/makeshift/internal/format"
+	"github.com/rs/zerolog/log"
 )
 
 const RESERVED_KEY = "kwargs"
 
 type KWArgs map[string]any
 
+func New() KWArgs {
+	return KWArgs{}
+}
+
 func (kw KWArgs) String() string {
-	b, _ := json.Marshal(kw)
-	return string(b)
+	return string(kw.Bytes())
+}
+
+func (kw KWArgs) Bytes() []byte {
+	b, err := json.Marshal(kw)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to marshal kwargs")
+		return []byte("{}")
+	}
+	return b
 }
 
 func (kw *KWArgs) Set(v string /* should be JSON object*/) error {