v0.2.0

What's New

Buffer I/O

Read and write .xlsx files entirely in memory without touching the filesystem.

Rust:

• Workbook::save_to_buffer() — serialize a workbook to a Vec<u8>
• Workbook::open_from_buffer(&[u8]) — open a workbook from a byte slice

Node.js (@sheetkit/node):

• Workbook.writeBufferSync() / Workbook.writeBuffer() — serialize to a Buffer
• Workbook.openBufferSync(data) / Workbook.openBuffer(data) — open from a Buffer

This is useful for serverless environments, streaming pipelines, and anywhere you want to avoid temporary files.

Formula Helpers

• set_cell_formula(sheet, cell, formula) — convenience method to set a formula on a single cell
• fill_formula(sheet, range, formula) — fill a single-column range (e.g. D2:D10) with a formula, automatically adjusting relative row references for each row while preserving absolute references ($A$1)

Internal Improvements

• Added shift_cell_references_with_abs() helper that respects absolute ($) markers when shifting cell references
• Fixed clippy::approx_constant and clippy::excessive_precision warnings in test code