Unclear handling of sequence data

Hi guys,
here I have yet another bunch of questions in regard to the handling of sequence data.
I have checked and compared all of the examples from the SDK in various versions, and all of them seem to do things differently, and the SDK documentation does not really shed any way on what is the expected or correct behaviour.
This applies especially to disposing and copying sequence data pointers, which can result in big problems concerning data leaks or access violations if done incorrectly, I suppose.
I tried to code a simple example that uses a very simple SequenceData (a struct only containing one int, see below), so I won't have to cope with flattening/unflattening.
In the snippet below, I implemented SequenceSetup(), SequenceSetdown() and SequenceResetup() and marked 6 parts with questions where the documentation and/or implementation in the examples is inconsistent.
It would be great if anyone with more insight could give some reliable answers on what you are expected to do there. :-)
Thanks,
Toby
struct SequenceData
    int param;
static PF_Err SequenceSetup(PF_InData* in_data, PF_OutData* out_data)
    AEGP_SuiteHandler suites(in_data->pica_basicP);
    // Q1: Are we allowed (or required) to delete the input sequence data if it exists ???
    if (in_data->sequence_data)
        suites.HandleSuite1()->host_dispose_handle(in_data->sequence_data);
    // Q2: Are we allowed (or required) to delete the output sequence data if it exists ???
    if (out_data->sequence_data)
        suites.HandleSuite1()->host_dispose_handle(out_data->sequence_data);
    PF_Handle outH = suites.HandleSuite1()->host_new_handle(sizeof(SequenceData));
    if (!outH) return PF_Err_OUT_OF_MEMORY;
    SequenceData* outP = static_cast<SequenceData*>(suites.HandleSuite1()->host_lock_handle(outH));
    if (outP)
        AEFX_CLR_STRUCT(*outP);
        outP->param = 0;
        out_data->sequence_data = outH;
        // Q3: Do we really NOT have to set flat_sdata_size ???
        // (according to the spec, it is unused, but still some samples set it)
        out_data->flat_sdata_size = sizeof(SequenceData);
        suites.HandleSuite1()->host_unlock_handle(outH);
    if (!out_data->sequence_data) return PF_Err_INTERNAL_STRUCT_DAMAGED;
    return PF_Err_NONE;
static PF_Err SequenceSetdown(PF_InData* in_data, PF_OutData* out_data)
    AEGP_SuiteHandler suites(in_data->pica_basicP);
    if (in_data->sequence_data)
        suites.HandleSuite1()->host_dispose_handle(in_data->sequence_data);
    // Q4: Are we required to set both in_data and out_data sequence_data pointers to NULL ???
    in_data->sequence_data = NULL;
    out_data->sequence_data = NULL;
    return PF_Err_NONE;
static PF_Err SequenceResetup(PF_InData* in_data, PF_OutData* out_data)
    AEGP_SuiteHandler suites(in_data->pica_basicP);
    PF_Handle outH = suites.HandleSuite1()->host_new_handle(sizeof(SequenceData));
    if (!outH) return PF_Err_OUT_OF_MEMORY;
    SequenceData* outP = static_cast<SequenceData*>(suites.HandleSuite1()->host_lock_handle(outH));
    if (outP)
        AEFX_CLR_STRUCT(*outP);
        if (in_data->sequence_data)
            SequenceData* inP = static_cast<SequenceData*>(DH(in_data->sequence_data));
            if (inP)
                outP->param = inP->param;
            // Q5: Are we allowed (or required) to delete the input sequence data if it exists ???
            suites.HandleSuite1()->host_dispose_handle(in_data->sequence_data);
        // Q6: Are we allowed (or required) to delete the output sequence data if it exists ???
        if (out_data->sequence_data) suites.HandleSuite1()->host_dispose_handle(out_data->sequence_data);
        out_data->sequence_data = outH;
        suites.HandleSuite1()->host_unlock_handle(outH);
    if (!out_data->sequence_data) return PF_Err_INTERNAL_STRUCT_DAMAGED;
    return PF_Err_NONE;

To answer my own questions:
Q1: in_data->sequence_data always seems to be NULL in this case, so no action necessary, but does no harm if it's in there
Q2: out_data->sequence_data always seems to be NULL in this case, so no action necessary, but does no harm if it's in there
Q3: out_data->flat_sdata_size is obsolete and should not be used
Q4: seems to do no harm and since sequence data is disposed anyway at that location, should be left in there
Q5: yes, this handle needs to be disposed here!
Q6: no, that is not necessary and even problematic (as it is the same as in_data->sequence data when the function is called)
Here is result of my research concerning sequence data from the last few days: http://reduxfx.com/ae_seqdata.pdf
Cheers,
Toby

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