Unboxed float array and records as pointer to double

[dbuenzli]

Is there any mechanism to pass arrays and records of OCaml floats only as a C double * value ?

[yallop]

This isn't currently supported, because the current approach makes it difficult to ensure that the GC won't move the array at an inconvenient moment. Stub generation (#15) is likely to make it easier to add support.

[dbuenzli]

Possible workaround here.

[yallop]

We should be able to support this using @whitequark's approach for strings (#143). There's an additional difficulty regarding alignment, which we can work around by falling back to a copy. @dbuenzli suggests exposing a flag to indicate when the platform relies on copying.