v0.4.0

What's Changed

This release packs 14 new features into a minor version bump — shapes, slicers, form controls, threaded comments, VBA extraction, SVG rendering, a CLI, and 54 new formula functions. Cell struct and SST memory optimizations cut Node.js RSS by 44-51% for sync reads (349MB to 195MB at 50k rows) and up to 95% for async reads (17MB). Rust peak memory holds steady at ~69MB for the same workload.

New Features

• Add sheetkit CLI for common workbook operations (#17)
• Preserve unknown ZIP entries for round-trip fidelity (#18)
• Add OpenOptions for partial workbook reading (#19)
• Add 14 additional chart types (57 total) (#20)
• Add 54 financial and engineering formula functions (164 total) (#22)
• Add shape support with preset geometries (#23)
• Add slicer support for table-based visual filters (#25)
• SVG renderer for worksheet visual output (#27)
• Add threaded comments support (Excel 2019+) (#28)
• Add VBA project extraction API for xlsm files (#34)
• Add number format renderer (#36)
• Chart and picture delete/get operations (#37)
• Add form controls (checkbox, radio button, dropdown, etc.) (#38)
• Format profiling, tables, data utils, sheet views (#16)

Performance

• Memory optimization for Cell struct, SST, and Vec allocation (#42)

Bug Fixes

• Fix engineering functions, VBA parsing, and sheet deletion bugs (#40)
• Fix duplicate addTable/getTables methods in Node.js wrapper
• Fix table column types in slicer/table tests

Documentation

• Add comprehensive documentation site with VitePress and API docs (#39)
• Improve documentation and update installation instructions (#41)

Full Changelog: v0.3.0...v0.4.0