Built-in sandbox SHIM: an xlsxwriter-compatible module backed by
com.blockether/imaging (Rust rust_xlsxwriter) so import xlsxwriter
writes real .xlsx files without the CPython package — and without Apache POI,
which cannot follow the CLI into the native image.
The Python side owns the whole workbook model and only crosses the boundary
ONCE, at close(): one string-keyed spec map in, base64 bytes out.
Built-in sandbox SHIM: an `xlsxwriter`-compatible module backed by `com.blockether/imaging` (Rust `rust_xlsxwriter`) so `import xlsxwriter` writes real .xlsx files without the CPython package — and without Apache POI, which cannot follow the CLI into the native image. The Python side owns the whole workbook model and only crosses the boundary ONCE, at `close()`: one string-keyed spec map in, base64 bytes out.
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