Content length vs actual size difference causing the file to trucate the data while downloading.

[spajai]

Trying to render file using
RenderFile Plugin

        $self->render_file(
            'filepath'            => $csv_file,
            'content_disposition' =>'attachment;filename='.$dataset_name.'.csv',
            'cleanup'             => 1,                     # delete file after completed
        );

`original bytes 4633400` (file produce on source by Linux `ls -la`) (Linux has returned me the file size on disk whereas Perl has returned me the file size of the actual content.)
`bytes sent 4628480`  <= (verified with (Mojo::Asset::File->new( path => $filepath );  print  $asset->size;)

`original wc -l 50001`
`received file wc -l 49949`

* When checking the source file size using Perl it's the same as the bytes sent.
but on receiving end the file content is getting truncated when compared to the source file and destination file,
I am missing something? 

due to a content-length mismatch.
The file content of CSV is getting truncated automatically.

I found the content length getting set differently from the actual file size.
the plugin is using the size from the Mojo::Asset::File whereas the actual size of a file remains a little higher than the content length.
did I miss something or does the plugin need to get content size differently?