Bounds error getting pointer of ReinterpretArray on 1.8+

[IanButterworth]

VideoIO tests are failing on 1.8 & master when a pointer is requested on a ReinterpretArray, repeatably but only some conditions
JuliaIO/VideoIO.jl#374

I serialized the array in 1.7, to reproduce the issue easily
1.7

julia> using ColorTypes, FixedPointNumbers

julia> img = deserialize("img")
100×100 reinterpret(UInt8, reinterpret(reshape, N0f8, ::Array{Gray{N0f8},2})):
 0x9d  0x46  0x5c  0xf5  0xbe  0xbc  0xa7  0x15  0xb4  0x27  0xd6  0x5f  …  0xfc  0xf6  0xf2  0xed  0xe1  0x0f  0xcd  0x02  0xba  0x1e  0xcc  0x81
...

julia> pointer(img, 1)
Ptr{UInt8} @0x00007fbb9ef2de80

1.8

julia> using ColorTypes, FixedPointNumbers

julia> img = deserialize("img")
100×100 reinterpret(UInt8, reinterpret(reshape, N0f8, ::Array{Gray{N0f8},2})):
 0x9d  0x46  0x5c  0xf5  0xbe  0xbc  0xa7  0x15  0xb4  0x27  0xd6  0x5f  0xc9  …  0x27  0xfc  0xf6  0xf2  0xed  0xe1  0x0f  0xcd  0x02  0xba  0x1e  0xcc  0x81
...

julia> pointer(img,1)
ERROR: BoundsError: attempt to access Tuple{} at index [1]
Stacktrace:
 [1] getindex(t::Tuple, i::Int64)
   @ Base ./tuple.jl:29
 [2] (::Base.var"#51#52")(t::Tuple{})
   @ Base ./tuple.jl:261
 [3] map(f::Base.var"#51#52", t::Tuple{Tuple{Int64}, Tuple{}, Tuple{Int64}})
   @ Base ./tuple.jl:223
 [4] heads(::Tuple{Int64}, ::Vararg{Tuple})
   @ Base ./tuple.jl:261
 [5] map (repeats 2 times)
   @ ./tuple.jl:266 [inlined]
 [6] _memory_offset(x::Base.ReinterpretArray{UInt8, 2, N6f10, Base.ReinterpretArray{N6f10, 2, Gray{N6f10}, Matrix{Gray{N6f10}}, true}, false}, I::Int64)
   @ Base ./abstractarray.jl:1192
 [7] pointer(x::Base.ReinterpretArray{UInt8, 2, N6f10, Base.ReinterpretArray{N6f10, 2, Gray{N6f10}, Matrix{Gray{N6f10}}, true}, false}, i::Int64)
   @ Base ./abstractarray.jl:1185
 [8] top-level scope
   @ REPL[31]:1

Here's the serialized img (as .txt so it can be attached)
img.txt