May

File writer could be updated to use the async / await syntax introduced with Swift 5.5

Since with all the syntactic sugar and especially with the changes made with the new parser, the documentation needs an update. Especially on * Reading whole files * Reading /...

The validation routines are currently very limited and do not cover many cases. It should be a piece of cake to implement most if not all of the rule for...

Implement CHECKSUM

2

Implementation of the CHECKSUM keyword according to the standard Appendix J

Improve implementation for random groups

3

"Random-groups structures" are currently not fully implemented but skipped over instead. To fully complete the implementation of the 4.0 Standard, PrimaryHDU should be extended by some high-level code to handle...