charsetSentinel property
final
Enable opt‑in charset detection via a utf8=✓
sentinel parameter.
If present anywhere in the input, the first occurrence will:
- be omitted from the result map, and
- override charset based on how the checkmark was encoded (UTF‑8 or Latin‑1).
If both charset and charsetSentinel are provided, the sentinel wins when found; otherwise charset is used as the default.
Implementation
final bool charsetSentinel;