Now that we have only one way to map function descriptors to method types, we should consider having the transformation be an instance method in FunctionDescriptor.

A related point is that the Linker API seems biased against sequence layouts, and this is probably a result of the fact that C arrays cannot be passed to functions, if not by reference.

But Panama doesn't have to be constrained in the same way. After all, a sequence layout is just a different way to describe a group layout - e.g. this:

MemoryLayout.groupLayout(
    JAVA_INT, JAVA_INT
)

is roughly similar to this:

MemoryLayout.sequenceLayout(2, JAVA_INT)

Supporting sequence layouts would make the API more symmetric, and most function descriptors (except those containing padding arguments/returns) could be turned into a valid method type.