RPSignatureResult.signatureImage stores PNG bytes as Uint8List.toString() — bloats payload ~4–5× and floods logs

_signatureController?.toPngBytes().then((image) {
widget._onFinished(
RPSignatureResult.withParams(
_firstNameController.value.text,
_lastNameController.value.text,
// Converting the Uint8List into a string to make it compatible with JSON serialization
image.toString(),
),
);
});

Locate RPSignatureResult and the signatureImage serialization path, starting with the shown toPngBytes callback. Inspect how the image value reaches JSON serialization and identify the project’s expected compact representation; done means PNG data is serialized without Uint8List.toString() and the resulting payload and logs are no longer inflated.

Written by the indexing model from the issue text.