fix(log): toString float32 precision loss and convert uint use FormatUint (#2461)

* fix(log): toString float32 precision loss

* convert uint to string

log/level.go

@@ -21,6 +21,10 @@ const (
 	LevelFatal
 )
 
+func (l Level) Key() string {
+	return LevelKey
+}
+
 func (l Level) String() string {
 	switch l {
 	case LevelDebug:

log/level_test.go

@@ -2,6 +2,12 @@ package log
 
 import "testing"
 
+func TestLevel_Key(t *testing.T) {
+	if LevelInfo.Key() != LevelKey {
+		t.Errorf("want: %s, got: %s", LevelKey, LevelInfo.Key())
+	}
+}
+
 func TestLevel_String(t *testing.T) {
 	tests := []struct {
 		name string