ToDo

• Better documentation (Wiki) → API-Documentation provided.
  
• Test in other .NET versions
• Upgrade to .NET 4.6 (currently 4.5; just a formal change as already running on 4.6 platform) (OK, v1.5.0)
• Further testing of styling (See NanoXLSX)
• Spell checking (code documentation and string outputs of code)
• Implementation of SharedStrings table to reduce the size of generated excel files (OK, v1.5.0)
• Adding more features like:
  • Joining of cells (OK, v1.2.0)
  • Autofilter (OK, v1.3.0)
  • Hidden cells (OK, v1.3.0)
  • Selection of cells (OK, v1.4.0)
  • Color of worksheet tab
  • Data validation
  • ...
• Consideration: Change numeric types from int, double and float to int, double and long (float is already covered by double, but long has a higher range than int) (OK, v1.5.0; added long)
• Changing of the (intermediate) string based XML generation approach to a pure document/XML object approach
• Keeping library in sync with PicoXLSX4j (Java)
• Backport of PicoXLSX4j Packer class to provide Windows RT compatibility (System.IO.Compression may be included in WinRT / WindowsPhone?) compatibility with .net Core (or Mono ?)
• Reconsider the usage of zero-based cell addresses. Maybe one-based is more logical for the user/developer (?)