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

[Zeroupper]

_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(),
),
);
});