First of all, i want to make sure isByteArrayPinned# is intended to let user know if a given 'ByteArray#/MutableByteArray#' is movable during safe FFI call, isn't it?

If that is the case, then the code for stg_isByteArrayPinnedzh is not enough, since not only bytes marked with BF_PINNED flag is not movable, but also the bytes which is marked with BF_LARGE. (I read the gc code and i'm confident this holds, but if it's not, please correct me).

Currently i'm using a FFI trickhttps://github.com/winterland1989/stdio/blob/master/cbits/bytes.c#L33 to get isByteArrayPinned# on older GHCs, i want to make sure if BF_LARGE works.