insertText() with format and formatHandler ignores style font()?

[neoshiva]

I cannot set font for cells with format and formatHandler.

$excel = new \Vtiful\Kernel\Excel(['path' => "/tmp/"]);
$excel->fileName('new.xlsx','sheet1');
$format = new \Vtiful\Kernel\Format($excel->getHandle());
$style = $format->font("Arial")->fontSize(13)->toResource();
$excel->insertText(0,0,123456789,"#,##0",$style)//   Calibri
->insertText(0,1,123456789,null,$style)// Arial
->insertText(1,0,"123456789","",$style)//   Arial
->insertText(1,1,"123456789",null,$style)// Arial
->insertText(2,0,1.234,"#,##0.0",$style)//   Calibri
->insertText(2,1,1.234,null,$style)// Arial
->output();

If the value is string, font seems ok even with format.

Is this a bug?

Tested on
Mac Homebrew PHP 7.4.33
Installed via PECL and the xlswriter version is 1.5.4.