Why is System.SpanHelpers || new ReadOnlySpan<T>(ref T, int length) internal?

[karakasa]

Recently I need to compare data stored in (ref T | ref byte) + length format, but I found there's no good way of doing that.

new ReadOnlySpan<T>(ref T, int length) is internal so I cannot create a ROS. The entire SpanHelpers class is internal so that I cannot use helper methods like SequenceEqual<T> (especially SequenceEqual(ref byte, ref byte, nint)), SequenceCompareTo, etc.

The methods don't seem unsafe at all. Is there a design consideration on this?

[stephentoub]

new ReadOnlySpan(ref T, int length) is internal so I cannot create a ROS

You want MemoryMarshal.CreateReadOnlySpan.

[huoyaoyuan]

Also note that, the MemoryMarshal or CollectionsMarshal class are considered "unsafe". Inappropriate usage can break the process. Other public APIs on Span or MemoryExtensions are considered safe.