NullSafety issues with pointyCastle on Web Builds

[jlambright]

I'm not sure why this is happening when we do release builds. Any thoughts?

`/root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/macs/cbc_block_cipher_mac.dart:103:46:
Warning: Operand of null-aware operation '!' has type 'Padding' which excludes null.

• 'Padding' is from 'package:pointycastle/api.dart' ('/root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/api.dart').
  var paddingName = _padding != null ? '/${_padding!.algorithmName}' : '';
  ^
  /root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/macs/cbc_block_cipher_mac.dart:203:7:
  Warning: Operand of null-aware operation '!' has type 'Padding' which excludes null.
• 'Padding' is from 'package:pointycastle/api.dart' ('/root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/api.dart').
  _padding!.addPadding(_buf, _bufOff);
  ^
  /root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/signers/ecdsa_signer.dart:94:41:
  Warning: Operand of null-aware operation '!' has type 'Mac' which excludes null.
• 'Mac' is from 'package:pointycastle/api.dart' ('/root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/api.dart').
  kCalculator = _RFC6979KCalculator(_kMac!, n, _pvkey!.d!, message);
  ^
  /root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/signers/ecdsa_signer.dart:166:7:
  Warning: Operand of null-aware operation '!' has type 'Digest' which excludes null.
• 'Digest' is from 'package:pointycastle/api.dart' ('/root/.pub-cache/hosted/pub.dev/pointycastle-3.9.0/lib/api.dart').
  _digest!.reset();`

[ikbendewilliam]

This looks like a warning in pointycastle itself? Maybe check there 🤔