Native abort when formatting a discovered config containing [[overrides]] #5

Summary

format aborts the Node process when the discovered config (or overrideConfig) contains [[overrides]]. serde_tombi panics:

thread '<unnamed>' panicked at tombi/rust/serde_tombi/src/ser.rs:155:17:
internal error: entered unreachable code: Document must be valid TOML.
thread caused non-unwinding panic. aborting.

Environment

• [email protected]
• Node v24.22.0 (darwin/arm64)
• native binding (not WASI)

Reproduction

tombi.toml:

[format.rules]
indent-table-key-value-pairs = true
indent-width = 4

[[overrides]]
files.include = ["**/*.toml"]

[overrides.format.rules]
indent-width = 6

import { format } from 'tombit'
// a.toml lives next to tombi.toml
await format('[t]\nkey = 1\n', '/tmp/tombit-repro/a.toml')

What works / what aborts

Notes

• @tombi-toml/[email protected] formats the same config without crashing (with config: { content, path }).
• The README says discovery includes [[overrides]] glob matching, so this should be supported.
• It looks like the merged config is re-serialized and the formatter rejects the document, hitting unreachable!("Document must be valid TOML.") at serde_tombi/src/ser.rs:155.