Changes in version 0.2.2                        

  - Dataframe Orientation: Added the dataframe argument to toggle
    between row-oriented output (default, [{...}]) and column-oriented
    output ({...}).
  - Context-Aware NA Handling: Implemented "Smart" default logic for
    missing values to match standard R conventions:
      - Default: In column mode, numeric NAs are coerced to "NA" strings
        to maintain array type homogeneity, while other types default to
        null. In row mode, NA values are omitted to reduce payload size.
      - Explicit: Specifying na = "null" or na = "string" strictly
        enforces the requested format regardless of the data type or
        structure.
  - Null Value Control: Added the null argument to control the
    serialization of NULL (empty) values in lists, supporting coercion
    to empty containers ("list", default) or explicit JSON null.

                        Changes in version 0.2.1                        

  - Scalar Serialization Support: Extended the as_json() interface to
    include the auto_unbox argument, enabling the serialization of
    length-one atomic vectors as native JSON scalars. This provides
    deterministic control over data typing, allowing specific
    distinction between singleton arrays and primitive scalar values in
    the output payload.

                        Changes in version 0.2.0                        

  - New Function: Added as_json(), a high-performance, generic
    serializer that handles sf objects, data frames, lists, and atomic
    vectors. It serves as a parallelized, drop-in replacement for
    jsonlite::toJSON().
  - Performance Engineering:
      - Geometry Arena: Implemented a contiguous memory arena for
        spatial data, flattening nested R lists into a linear structure
        to eliminate allocation overhead during parallel processing.
      - Direct-Heap Writing: Switched to ryu::raw for floating-point
        formatting, writing bytes directly to the final memory buffer to
        bypass stack copies.
      - LUT Escaping: Implemented a static Look-Up Table (LUT) for
        string escaping, enabling O(1) scanning of characters.
      - Loop Batching: Optimized vector writes by batching JSON tokens
        (e.g., ",[") to minimize capacity checks.

                 Changes in version 0.1.2 (2026-01-19)                  

  - Fixed _abort symbol warnings on macOS and Linux by implementing
    proper Rust build artifact cleanup.
  - Achieved clean compilation (0 warnings) across Windows, macOS, and
    Linux.

                        Changes in version 0.1.1                        

  - Build Stability: Pinned the compilation environment to Rust 1.75 via
    rust-toolchain.toml. This ensures strictly reproducible builds and
    maximizes compatibility with deployment servers like shinyapps.io
    and Posit Connect.
  - Documentation: Added a "Deploying to shinyapps.io" guide to the
    README.

                        Changes in version 0.1.0                        

  - Initial Release: Introduced fastgeojson, a high-performance JSON and
    GeoJSON serializer backed by Rust.
  - Core Functions:
      - Added sf_geojson_str(): Converts sf objects to GeoJSON
        FeatureCollections.
      - Added df_json_str(): Converts data frames to JSON arrays of
        objects.
  - Performance: Implemented multi-threaded processing using the Rust
    rayon crate for massive datasets.
  - Integration: Output strings are assigned the json and geojson
    classes to enable zero-copy transfer in Shiny and Plumber
    applications.