Changes in version 0.2.5 (2025-11-23)                  

  - replaced STRING_PTR with STRING_PTR_RO (as per CRAN requirements)

                 Changes in version 0.2.4 (2024-01-15)                  

  - factor levels remain sfheaders issue 89

                 Changes in version 0.2.2 (2023-02-28)                  

  - removed C++ system requirements

                 Changes in version 0.2.1 (2023-02-23)                  

  - updated C++ dependencies
  - nest_impl() function for nesting & un-nesting lists

                 Changes in version 0.2.0 (2020-11-26)                  

  - user can add closed attribute added to shapes if the first row is
    repeated at the end of a matrix
  - nest.hpp - re-enabled
  - columns.hpp - templated column_positions() and handles data.frame
    inputs