roo-rb/roo-xls

Thanks for filing an issue. Following these instructions will help us solve your problem sooner.

### Steps to reproduce

1. Create an executable test case for this issue ([sample test case](https://gist.github.com/tgturner/4e2b590e0218d3b261269aa662b6a7cb))
2. You can share your executable test case as a [gist](https://gist.github.com), or simply paste the content into the issue description.
  - You can execute the test case by running `ruby the_file.rb` in your terminal. If all goes well, you should see your test case failing.
3. Please provide a stripped down version of the offending spreadsheet.

### Issue
Describe the issue

### System configuration
**Roo::Xls version**:

**Ruby version**: