The streaming load/save example does not work

julia> using DataFrames, CSVFiles, FileIO

julia> df = DataFrame(a = [1,2,3], b = [4,5,6]);

julia> stream = IOBuffer();

julia> fileiostream = Stream(format"CSV", stream);

julia> save(fileiostream, df)

julia> load(fileiostream)
0x0 CSV file
Error showing value of type CSVFiles.CSVStream:
ERROR: MethodError: no method matching zero(::Type{Any})
Closest candidates are:
  zero(::Type{Union{Missing, T}}) where T at missing.jl:87
  zero(::Type{LibGit2.GitHash}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/LibGit2/src/oid.jl:220
  zero(::Type{Pkg.Resolve.VersionWeights.VersionWeight}) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/Pkg/src/resolve/VersionWeights.jl:19
  ...
Stacktrace:
 [1] zero(::Type{Any}) at ./missing.jl:87
 [2] reduce_empty(::typeof(+), ::Type) at ./reduce.jl:227
 [3] reduce_empty(::typeof(Base.add_sum), ::Type) at ./reduce.jl:234
 [4] mapreduce_empty(::typeof(identity), ::Function, ::Type) at ./reduce.jl:251
 [5] _mapreduce(::typeof(identity), ::typeof(Base.add_sum), ::IndexLinear, ::Array{Any,1}) at ./reduce.jl:305
 [6] _mapreduce_dim at ./reducedim.jl:308 [inlined]
 [7] #mapreduce#548 at ./reducedim.jl:304 [inlined]
 [8] mapreduce at ./reducedim.jl:304 [inlined]
 [9] _sum at ./reducedim.jl:653 [inlined]
 [10] _sum at ./reducedim.jl:652 [inlined]
 [11] #sum#550 at ./reducedim.jl:648 [inlined]
 [12] sum(::Array{Any,1}) at ./reducedim.jl:648
 [13] #printtable#1(::Bool, ::Function, ::IOContext{REPL.Terminals.TTYTerminal}, ::TableTraitsUtils.TableIterator{NamedTuple{(),Tuple{}},Tuple{}}, ::String) at /Users/harry/.julia/packages/TableShowUtils/ImkA9/src/TableShowUtils.jl:43
 [14] printtable(::IOContext{REPL.Terminals.TTYTerminal}, ::TableTraitsUtils.TableIterator{NamedTuple{(),Tuple{}},Tuple{}}, ::String) at /Users/harry/.julia/packages/TableShowUtils/ImkA9/src/TableShowUtils.jl:7
 [15] show(::IOContext{REPL.Terminals.TTYTerminal}, ::CSVFiles.CSVStream) at /Users/harry/.julia/packages/CSVFiles/KysmQ/src/CSVFiles.jl:38
 [16] show(::IOContext{REPL.Terminals.TTYTerminal}, ::MIME{Symbol("text/plain")}, ::CSVFiles.CSVStream) at ./sysimg.jl:194
 [17] display(::REPL.REPLDisplay, ::MIME{Symbol("text/plain")}, ::Any) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:131
 [18] display(::REPL.REPLDisplay, ::Any) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:135
 [19] display(::Any) at ./multimedia.jl:287
 [20] #invokelatest#1 at ./essentials.jl:742 [inlined]
 [21] invokelatest at ./essentials.jl:741 [inlined]
 [22] print_response(::IO, ::Any, ::Any, ::Bool, ::Bool, ::Any) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:155
 [23] print_response(::REPL.AbstractREPL, ::Any, ::Any, ::Bool, ::Bool) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:140
 [24] (::getfield(REPL, Symbol("#do_respond#38")){Bool,getfield(REPL, Symbol("##48#57")){REPL.LineEditREPL,REPL.REPLHistoryProvider},REPL.LineEditREPL,REPL.LineEdit.Prompt})(::Any, ::Any, ::Any) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:714
 [25] #invokelatest#1 at ./essentials.jl:742 [inlined]
 [26] invokelatest at ./essentials.jl:741 [inlined]
 [27] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/LineEdit.jl:2273
 [28] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:1035
 [29] run_repl(::REPL.AbstractREPL, ::Any) at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:192
 [30] (::getfield(Base, Symbol("##734#736")){Bool,Bool,Bool,Bool})(::Module) at ./client.jl:362
 [31] #invokelatest#1 at ./essentials.jl:742 [inlined]
 [32] invokelatest at ./essentials.jl:741 [inlined]
 [33] run_main_repl(::Bool, ::Bool, ::Bool, ::Bool, ::Bool) at ./client.jl:346
 [34] exec_options(::Base.JLOptions) at ./client.jl:284
 [35] _start() at ./client.jl:436

I took a look at the tests, which include mark and reset statements. When I add these statements, it works:

julia> stream = IOBuffer();

julia> fileiostream = Stream(format"CSV", stream);

julia> mark(stream)
0

julia> save(fileiostream, df)

julia> reset(stream)
0

julia> mark(stream)
0

julia> load(fileiostream)
3x2 CSV file
a │ b
──┼──
1 │ 4
2 │ 5
3 │ 6

Weirdly, that works in the REPL, but not in Atom, where I get the same stacktrace as above.

Start with the streaming example using Stream(format"CSV", stream), save, and load, then compare it with the tests that use mark and reset. Inspect the CSVFiles.jl show entry point at line 38 and reproduce the behavior in both the REPL and Atom; done means the example works without the reported zero(::Type{Any}) failure.