$ perl -Mblib -MDP -MSpreadsheet::Read -we'DDumper ReadData ("sandbox/x-0.9888.xlsx")'
[
    {   error            => undef,
        parser           => 'Spreadsheet::ParseXLSX',
        sheet            => {
            Blad1            => 1
            },
        sheets           => 3,
        type             => 'xlsx',
        version          => '0.17'
        },
    {   A1               => '0.98880000000000001',
        attr             => [],
        cell             => [
            [],
            [   undef,
                '0.98880000000000001'
                ]
            ],
        label            => 'Blad1',
        maxcol           => 1,
        maxrow           => 1,
        merged           => []
        }
    ]
$ env SPREADSHEET_READ_XLSX=Spreadsheet::XLSX perl -Mblib -MDP -MSpreadsheet::Read -we'DDumper ReadData ("sandbox/x-0.9888.xlsx")'
[
    {   error            => undef,
        parser           => 'Spreadsheet::XLSX',
        sheet            => {
            Blad1            => 1
            },
        sheets           => 3,
        type             => 'xlsx',
        version          => '0.13'
        },
    {   A1               => '0.99',
        attr             => [],
        cell             => [
            [],
            [   undef,
                '0.98880000000000001'
                ]
            ],
        label            => 'Blad1',
        maxcol           => 1,
        maxrow           => 1,
        merged           => []
        }
    ]
$ env SPREADSHEET_READ_XLSX=Spreadsheet::XLSX::Reader::LibXML perl -Mblib -MDP -MSpreadsheet::Read -we'DDumper ReadData ("sandbox/x-0.9888.xlsx")'
XLSX parser cannot parse data:  at -e line 1.


##</code><code>##

C:\Tmp> perl -MDP -MSpreadsheet::Read -we"DDumper ReadData ('x-0.9888.xlsx')"
[
    {   error            => undef,
        parser           => 'Spreadsheet::ParseXLSX',
        sheet            => {
            Blad1            => 1
            },
        sheets           => 3,
        type             => 'xlsx',
        version          => '0.17'
        },
    {   A1               => '0.9888',
        attr             => [],
        cell             => [
            [],
            [   undef,
                '0.9888'
                ]
            ],
        label            => 'Blad1',
        maxcol           => 1,
        maxrow           => 1,
        merged           => []
        }
    ]


##</code><code>##

$ xml_pp < xl/worksheets/sheet1.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<worksheet mc:Ignorable="x14ac"
           xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
           xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac">
  <dimension ref="A1"/>
  <sheetViews>
    <sheetView tabSelected="1" workbookViewId="0"/>
    </sheetViews>
  <sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/>
  <sheetData>
    <row r="1" spans="1:1" x14ac:dyDescent="0.25">
      <c r="A1">
        <v>0.98880000000000001</v>
        </c>
      </row>
    </sheetData>
  <pageMargins bottom="0.75" footer="0.3" header="0.3" left="0.7" right="0.7" top="0.75"/>
  </worksheet>
$