Constant artichoke_backend::sys::specifiers::NULLABLE_CARRAY_AND_LEN

pub const NULLABLE_CARRAY_AND_LEN: &str = "a!";

Receive two arguments, a C Array of mrb_values and len. Gives (NULL, 0) for nil. Usable like:

mrb_get_args(mrb, "a", &ptr, &blen);