Reading causes loss of precision without any warning

[Brandyparty]

This is:

- [x] a bug report
- [ ] a feature request
- [ ] **not** a usage question (ask them on https://stackoverflow.com/questions/tagged/phpspreadsheet or https://gitter.im/PHPOffice/PhpSpreadsheet)

What is the expected behavior?

A reader should read the data as it is. All data should be converted correctly without loss of precision.

What is the current behavior?

Numbers are converted losing precision. The number '753,149999999999' for example gets changed to '753.15'.

What are the steps to reproduce?

Please provide a Minimal, Complete, and Verifiable example of code that exhibits the issue without relying on an external Excel file or a web server:

<?php

require __DIR__ . '/vendor/autoload.php';

// Create new Spreadsheet object
$spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();

// add code that show the issue here...
$spreadsheet = reader->load('yourexcel.xlsx');
$spreadsheet = $this->spreadSheetPreparationForWrite($spreadsheet, 1);
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Csv($spreadsheet);
$writer->setSheetIndex(1);
$writer->save('savedas.csv');
### Which versions of PhpSpreadsheet and PHP are affected?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
If this is still an issue for you, please try to help by debugging it further and sharing your results.
Thank you for your contributions.

[oleibman]

Reopening. Expect a PR soon.