: malloc-underlying ( obj -- alien )
    underlying>> malloc-byte-array ;

: sequence>arg ( seq type -- alien )
    {
        { "bool*"    [ >bool-array ] }
        { "char*"    [ >char-array ] }
        { "uchar*"   [ >uchar-array ] }
        { "short*"   [ >short-array ] }
        { "ushort*"  [ >ushort-array ] }
        { "int*"     [ >int-array ] }
        { "uint*"    [ >uint-array ] }
        { "long*"    [ >long-array ] }
        { "ulong*"   [ >ulong-array ] }
        { "float*"   [ >float-array ] }
        { "double*"  [ >double-array ] }
        { "void*"    [ [ (obj>arg) ] map >void*-array ] }
        { "bool**"   [ [ >bool-array malloc-underlying ] map >void*-array ] }
        { "char**"   [
            dup first string?
            [ utf8 strings>alien ]
            [ [ >char-array malloc-underlying ] map >void*-array ] if ] }
        { "uchar**"  [ [ >uchar-array malloc-underlying ] map >void*-array ] }
        { "short**"  [ [ >short-array malloc-underlying ] map >void*-array ] }
        { "ushort**" [ [ >ushort-array malloc-underlying ] map >void*-array ] }
        { "int**"    [ [ >int-array malloc-underlying ] map >void*-array ] }
        { "uint**"   [ [ >uint-array malloc-underlying ] map >void*-array ] }
        { "long**"   [ [ >long-array malloc-underlying ] map >void*-array ] }
        { "ulong**"  [ [ >ulong-array malloc-underlying ] map >void*-array ] }
        { "float**"  [ [ >float-array malloc-underlying ] map >void*-array ] }
        { "double**" [ [ >double-array malloc-underlying ] map >void*-array ] }
        { "void**"   [ [ [ (obj>arg) ] map >void*-array malloc-underlying ] >void*-array ] }
    } case malloc-underlying ;