Converting null literal or possible null value to non-nullable type.

Argument of type 'Dictionary<char, AhoCorasick.Node>' cannot be used for parameter 'dictionary' of type 'Dictionary<char, AhoCorasick.Node?>' in 'Node? Extensions.GetValueOrDefault<char, Node?>(Dictionary<char, Node?> dictionary, char key, Node? defaultValue = null)' due to differences in the nullability of reference types.

Converting null literal or possible null value to non-nullable type.

Possible null reference return.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Possible null reference return.