Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions/setup-dotnet@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The specified version string '0.4.0.0-pre' does not conform to the recommended format - major.minor.build.revision

Unboxing a possibly null value.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'extensionType' in 'HeaderDataUnitType FitsDocumentReader.ParseHduType(string extensionType)'.

Possible null reference argument for parameter 'header' in 'DataContentType FitsDocumentReader.ExtractDataContentType(Header header)'.

Possible null reference argument for parameter 'header' in 'DataContentType FitsDocumentReader.ExtractDataContentType(Header header)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'header' in 'Task<(bool endOfStreamReached, HeaderDataUnit data)> IHduDeserializer.DeserializeAsync(PipeReader reader, Header header)'.