Upgrade zonetree - #21

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v3, actions/setup-dotnet@v3. Actions will be forced to run with Node.js 24 by default starting June 16th, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

In externally visible method 'TRecord[] AdvancedSearchOnIndexOfTokenRecordPreviousToken<TRecord, TToken>.Search(SearchQuery<TToken> query, CancellationToken cancellationToken = default(CancellationToken))', validate parameter 'query' is non-null before using it. If appropriate, throw an 'ArgumentNullException' when the argument is 'null'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)

In externally visible method 'SearchQuery<ulong> HashedSearchQueryFactory.FromStringSearchQuery(SearchQuery<string> query, IHashCodeGenerator hashCodeGenerator, IWordTokenizer wordTokenizer)', validate parameter 'query' is non-null before using it. If appropriate, throw an 'ArgumentNullException' when the argument is 'null'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)

In externally visible method 'QueryNode<ulong> HashedSearchQueryFactory.FromStringQueryNode(QueryNode<string> node, IHashCodeGenerator hashCodeGenerator, IWordTokenizer wordTokenizer)', validate parameter 'node' is non-null before using it. If appropriate, throw an 'ArgumentNullException' when the argument is 'null'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)

'NodeType == QueryNodeType.Or' is always 'true'. Remove or refactor the condition(s) to avoid dead code. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1508)

Exception type System.Exception is not sufficiently specific (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2201)

Member 'GetPrecedence' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Exception type System.Exception is not sufficiently specific (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2201)

In externally visible method 'void WordTokenizer.AddStopWords(string[] stopWords)', validate parameter 'stopWords' is non-null before using it. If appropriate, throw an 'ArgumentNullException' when the argument is 'null'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)

Properties should not return arrays (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1819)